大学英语四级语法精要

一、动词(时态，语态，用法，省略，一致性等)

（一）时态

1、主动形式

2

、被动形式

· CET-4

常考的三种时态：过去完成时；将来完成时；（现在/过去）完成进行时。

· 时间状语从句当中的时态：

     一般过去时         所有的过去

用    一般现在时     表示 现在和将来

现在完成时          现在完成和将来完成

3、现在完成进行时态 (have/has been + -ing 分词构成): 动作或状态从过去某时开始,继续到现在,可能继续下去,也可能刚刚结束.

· I've been writing letters for an hour. I've been sitting in the garden.

4、过去完成进行时(由had been + ing分词构成): 过去某个时刻以前一直在进行的动作

· We had been waiting for her for two hours by the time she came.

5、将来完成进行时: 将来某个时刻以前一直在进行的动作.

· By next summer, he will have been working here for twenty years.

6、将来完成时(由shall/will have + 过去分词构成): 将来某时会业已发生的事.

· I shall have finished this one before lunch.

They'll have hit the year's target by the end of October.

（二）语态

1、可以有两种被动结构的类型,例如:

· He was said to be jealous of her success.

It was said that he was jealous of her success.

· 能同时适用于上述两个句型的主动词通常都是表示"估计"，"相信"等意义的动词，常见的有：assume,believe,expect,fear,feel,know,presume,report,say,suppose,understand等。

· It is supposed that the ship has been sunk. The ship is supposed to have been sunk.

2、担当be supposed to 与不定式的一般形式搭配时往往表示不同的意义。

· Why are you driving so fast in this area? You are supposed to know the speed to know the speed limit. (你应该晓得速度限制)

3、双宾语及宾补结构的被动语态

1）双宾语结构的被动语态: 双宾语结构变为被动语态时,可以把主动结构中的一个宾语变为主语,另一个宾语仍然保留在谓语后面,但多数是把间接宾语变为主语。

· He was asked a number of questions at the press conference.

Two days were allowed them for making the necessary preparations.

1. 宾补结构的被动语态:

   · She was called Big Sister by everybody.

4、短语动词

1）Vi. + adv.：The plane took off two hours late.

2）Vi. + prep.：They looked round the Cathedral.

3）Vi. + prep. (有被动语态)：She's looking after her sister's children.

4）Vi. + adv. + prep.：I began to look forward to their visits.

5）Vt. + O + adv.：Some women choose to stay at home and bring up their children.

The children were brought up by their mother.

1. Vt. + adv. + O (无被动语态)：I am trying to give up smoking.

7）Vt. + O + prep.：We talked Donald into agreement.

（三）省略

1、在以as, than, when, if, unless等引导的从句中的省略: 在有些状语从句中,如果谓语包含有动词be,主语又和主句的主语一致a),或者主语是it b),就常常可以把从句中的主语和谓语的一部分(特别是动词be)省略掉.

1）Look out for cars when crossing the street.

When taken according to the directions, the drug has no side effects.

If not well managed, irrigation can be harmful.

Though reduced in numbers, they gained in fighting capacity.

He said that no acrobat could ever perform those daring feats unless trained very young.

Once having made a promise, you should keep it.

2）If necessary I'll have the letter duplicated.

As scheduled, they met on January 20 at the Chinese Embassy.

2、在以than a) 或 as b) 引起的从句中,常会有一些成分省略.

1）He told me not to use more material than (it is) necessary.

We should think more of the collective than of ourselves.

2）They worked with as much enthusiasm as young people (did).

He is now a vice-manager, but still often works in the kitchen as before.

Their training is free, as is all education.

We will, as always, stand on your side.

3、错误的省略

1）His life is as fully committed to books as anyone I know.

2）While standing there in her nightgown, two bullets struck the wall beside her.

（四）一致

1、主谓一致（与插入语无关） 

1）主谓的分隔原则：主谓之间可以用定语从句或者省略的定语从句分隔。

2）定语从句中的主谓一致

3）随前一致：

n. + together with；as well as；including；along with；with / of；accompanied with / by

4）就近原则

5）如果主语表示的是同一个概念，同一人，同一事的时候，谓语动词用单数，这种结构的特征是and连接 的两个词只有一个冠词。

· The iron and steel industry is very important to our country.

· The head master and mathematical teacher is coming.

· The head master and the mathematical teacher are coming.

· 类似的还有：law and order；bread and；butter　black and white；To love and to be loved is …；A lawyer and a teacher are…；A lawyer and teacher is …

6）随后原则：not A but B / not only A but also B+v.(与B一致)

7）百分比结构：most，half，rest，some，majority，one + persent；of+n1+v.（由n1决定）

8）倒装结构的主谓一致：

· There be +n　由名词决定动词

· Among , between等介词位于句首引起倒装结构：Among / Between …+系动词+n. （由名词决定动词）

9）The + adj.的主谓一致：

· 当表示"一类人"

· 当表示某一抽象概念时。例：The good is always attractive.

10） To do/doing/主从+vs. 例：More than one + n.；many a +n.；a day or two

2、如果主语是单数,尽管后面跟有with, together with, as well as, as much as, no less than, more than等引导的短语,谓语动词仍旧用单数形式.

· Terry, along with her friend, goes skating every Saturday.

An expert, together with some assistants, was sent to help in this work.

The captain, as well as the coaches, was disappointed in the team.

3、代词作主语时一致

1）each, either, neither和由some, any, no, every构成的复合代词,作单数看待.

· Each of us has something to say. Is everybody ready? Somebody is using the phone.

1. some, few, both, many 等作复数
2. some 可后接复数,也可接单数,表示某一。none作复数看待时较多,但也有时作单数看待,主要看说话人脑中联系想到的是复数还是单数概念, 但none 在代表不可数的东西时总是看作单数:

   · None of the books are easy enough for us. None of us seem to have thought of it.

None (= nobody) has felt it more keenly than she did. None of this worries me.

4）all 和most 可后接复数,也可接不可数名词 (all of the…, most of the …), 动词用单数.

4、由and 或 both… and 连接名词词组时, 后用复数; 由not only…but (also), either…or, neither…nor或 or 连接的并列主语, 谓语通常和最邻近的主语一致.

1）Not only the switches but also the old writing has been changed.

My sister or my brother is likely to be at home.

Neither my wife nor I myself am able to persuade my daughter to change her mind.

2）如果一个句子是由there 或here引导, 而主语又不止一个, 谓语通常也和最邻近的那个主语一致.

· There was carved in the board a dragon and a phoenix.

Here is a pen, a few envelopes and some paper for you.

5、people, police, cattle, poultry (家禽), militia (民兵) 等通常都用作复数.

1）Cattle are grazing on the pasture.

The police are looking for him.

2）有些集体名词有时作单数看待, 有时作复数看待, 主要根据意思来决定.

· His family isn't very large.

The committee meets twice a month.

The audience was enormous.

The audience were greatly moved at the words.

3）有些名词单复数同形, 可根据意思决定谓语动词的数:

· This new series is beginning next month.

These new series are beginning next month.

This species is now extinct.

These species are now extinct.

6、表示时间, 重量, 长度, 价值等的名词, 尽管仍是复数形式, 如果作整体看待, 动词也可用单数形式 (当然用复数动词也是可以的):

· Three weeks was allowed for making the necessary preparations.

One hundred li was covered in a single night.

7、其他问题

1）书名, 国家名用单数:

· Tales from Shakespeare is a book by Charles Lamb.

1. 学科名, 如mathematics, economics用单数.
2. many a 或more than one 所修饰的词作主语时, 谓语动词多用单数形式:

   · Many a person has had that kind of experience.

   More than one person has involved in the case.

   4）a number of 后接复数, the number of后接单数:

· A number of books have been published on the subject.

The number of books published on the subject is simply amazing.

5）one of those 后用单数. 在"one of + 复数名词 +关系分句"结构中，关系分句中谓语动词的单复数形式在一般情况下有两形式，一是根据先行词采用复数形式：

· Joan is one of those people who go out of their way to be helpful.

6）当one 之前与the only 等限定词和修饰语时，关系分句谓语动词根据one 而定，即采用单数形式：

· He is the only one of those boys who is willing to take on another assignment.

二、非谓语动词

（一）不定式

1、形式

1. 完成式: 不定式的一般形式所表示的动作, 通常与主要谓语表示的动作(状态)同时(或几乎同时)发生, 或是在它之后发生. 假如不定式所表示的动作, 在谓语所表示的动作(状态)之前发生, 就要用不定式的完成式.

· I am glad to have seen your mother (= I am glad I have seen your mother).

(比较: I am glad to see you.)

He is said to have written a new book about workers.

He pretended not to have seen me.

1. 进行式: 如果主要谓语表示的动作(状态)发生时, 不定式表示的动作正在进行, 这时要用不定式的进行式.

   · You are not supposed to be working. You haven't quite recovered yet.

   We didn't expect you to be waiting for us here.

   He pretended to be listening attentively.

   1. 完成进行式: 在谓语所表示的时间之前一直进行的动作, 就要用不定式的完成进行式.

      · The struggle was known to have been going for twenty years.

      We are happy to have been working with you.

   2. 被动式: 当不定式的逻辑上的主语是不定式所表示的动作的承受者时, 不定式一般要用被动形式.

      · It is an honor for me to be asked to speak here. She hated to be flattered.

      He wanted the letter to be typed at once. This is bound to be found out.

There are a lot of things to be done. She was too young to be assigned such work.

2、不定式的常考形式：

1）一般形式：He decided to work harder in order to catch up with the others.

被动形式: He preferred to be assigned some heavier work to do.

语法功能：表示与谓语动词同步发生

2）完成形式：He pretended not to have seen me.

被动形式：The book is said to have been translated into many languages.

语法功能：表示发生在谓语动词之前

3、不定式常考的考点：

1）不定式做定语----将要发生

2）不定式做状语----目的

3）不定式充当名词功能---To see is to believe.

4、不定式的省略

1）感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do 表示动作的完整性，真实性；+ doing 表示动作的连续性，进行性

　 I saw him work in the garden yesterday.昨天我看见他在花园里干活了。(强调"我看见了"这个事实)

　 I saw him working in the garden yesterday.昨天我见他正在花园里干活。（强调动作）

2）感官动词后面接形容词而不是副词：The cake tastes good; It feels comfortable.

3）使役动词：have bid make let 等词后不定式要省略但同1)一样被动以后要还原to

I'd like to have John do it. I have my package weighed.

4）help；help sb do；help sb to do；help do help to do

5、有些动词后只跟不定式如：

want，wish，hope，manage，promise，refuse，pretend，plan， offer，decide，agree，expect，allow sb. to do，cause sb. to do，permit sb. to do，enable sb. to do，force sb. to do，be more likely to do，love to do，warn sb. to do，be able to do，be ambitious to do，begin to do，start to do

6、有的时候to后面要接-ing形式

accustom (oneself) to，be accustomed to，face up to，in addition to，look forward to， object to， be reduced to， resign oneself to， be resigned to， resort to， sink to， be used to， be alternative to， be close/closeness to， be dedication/dedicated to， be opposition/opposed to， be similarity/similar to.

7、功用: 不定式可以作主语 (a), 宾语 (b), 表语 (c), 定语 (d) 或是状语 (e).

a. To scold her would not be just.

b. We are planning to build a reservoir here.

c. One of our main tasks now is to mechanize agriculture.

d. Do you have anything to declare?

e. We have come to learn from you.

1）to 的不定式:

· 在"动词+ 宾语+不定式"结构中, 如果动词是表示感觉意义的see, hear, watch, smell, feel, notice等, 或是表示"致使"意义的 have, make, let等, 其后的不定式结构不带to.

John made her tell him everything.

· 这类结构转换为被动语态时, 后面的不带to 的不定式一般还原为带to 的不定式.

She was made to tell him everything.

· 在 had better, had best, would rather, would sooner, would just as soon, might (just) as well, cannot but 等搭配之后, 动词不定式也不带to。如I'd rather not have eggs and bacon for breakfast. They cannot but accept his term.

· 在make do, make believe, let drop, let fall, let fly, let slip, let drive, let go of, let there be, hear say, hear tell, leave go of等固定搭配中, 用不带to的动词不定式.

John let fly a torrent of abuse at me.

· 在动词help(或help +宾语)之后可用不带to的不定式, 也可用带to的不定式.

Can I help (to) lift this heavy box?

· 在介词except, but 之后, 如果其前有动词do的某种形式, 不定式一般不带to, 反之带to.

There is nothing to do except wait till it stops raining.

Smith will do anything but work on a farm.

There's no choice but to wait till it stops raining.

· 连词 rather than, sooner than 置于句首时, 其后的不定式不带to.

Rather than push the book back as he wanted to do, he forced himself to pick it up.

· 出现在句中其他位置时, 其后的不定式有时带to, 有时不带to.

He decided to write rather than telephone.

The manager believes it is important to invest in new machinery rather than to increase wages.

· 用作补语的动词不定式, 如果主语是由"all + 关系分句"，"thing +关系分句"，"what分句"或"thing +不定式结构"等构成，并带有do的某种形式，这时，作为主语补语的不定式可以省to，也可以不省.

What he will do is (to) spoil the whole thing.

The only thing I can do now is go on by myself.

The thing to do now is clear up this mess.

1. 不定式的其他用法

· too…to 结构通常表示否定意义:

She was too young to understand all that.

· enough…to结构则表示肯定意义:

She was not old enough to understand all that.

· not too, but too, all too, only too等和不定式连用时,不定式一般不表示否定意义:

He's only too pleased to help her.

· so…as (to)这种结构也可用不定式作状语:

Be so kind as to drop in some time when you are free.

1. 如果要说明不定是表示的动作是谁做的, 可以在不定式前加一个for引起的短语:

· It is not hard for one to do a bit of good.

It is a great honor for us to be present at this rally.

4）在以某些形容词(如 kind, good, nice, wise, unwise, clever, silly, wrong, right, foolish, stupid, careless, considerate, rude, naughty, impolite等)作表语时, 不定式前可加一个of引起的短语, 来说明不定式指的是谁的情况:

· It's kind of you to think so much of us.

It's very nice of you to be so considerate.

It's unwise of them to turn down the proposal.

（二）need/want 后的-ing形式具有被动的意思。其中，want不太常用。

如：He needs (a lot of) encouraging.

（三）动名词：具有动作性特征的名词（是名词：seeing is believing；具有动词性特征可以带宾语 starving troops is necessary）

1、动名词的形式:

一般形式：I don't like you smoking.

完成形式：I regret not having taken your advice.

被动形式：This question is far from being settled.

2、动名词常考的点

1）动名词做主语谓语动词为单数

2）在动名词和不定式中,做为介词的宾语是动名词

3）动名词的否定直接在其前加否定词,通过代词的宾格或所有格形式给出逻辑主语.

I would appreciate_______ back this afternoon．

A．you to call B．you call C．you calling D．you're calling（Key：C your calling 也对）

I regret not having taken your advice.

4）有些词后只能接动名词

admit，appreciate，avoid，celebrate，consider，contemplate，defer，delay，deny，detest， discontinue，dislike，dispute，enjoy，it entails，escape，excuse，explain，fancy，feel like， finish，forgive，can't help，hinder，imagine，it involves，keep，it means，mention，mind， miss，it necessitates，pardon，postpone，practice，prevent，recall，report，resent，resist， risk，suggest，understand.另还有一些接-ing形式的常用说法：it's no good，it's no/little/hardly any/ use，it's not/hardly/scarcely use，it's worthwhile，spend money/time，there's no，there's no point in，there's nothing worse than，what's the use/point.

5）有些词后加不定式和动名词均可

· remember, forget, try, stop, go on, cease, mean后面用不定式和-ing形式，意义截然不容。

I remembered to post the letters. (指未来/过去未来的动作)

I remembered posting/having posting the letters (我记得这个动作)

· forgot与remember的用法类似。

I regret to inform you that… 我很遗憾地通知你…

I regretted having left the firm after twenty years. 为了"二十年前的离开"而遗憾。

· try to 努力 You really must try to overcome your shyness.

· try –ing 试验 Try practicing five hours a day.

I mean to go, but my father would not allow me to. [打算、想]我想去，但我父亲不让我去。

To raise wage means increasing purchasing power. [意味着]赠加工资意味着增加购买力。

· prefer的用法：

I prefer to wait here. （所以啊，你不介意的话，我就等下去。）

I prefer waiting here.（我正在这里等，我就喜欢这么做。）

I prefer swimming to cycling. （这个句子里面就不能用不定式了。）

3、分词：现在分词主动进行,过去分词被动状态

1）现在分词的形式:

· 一般式: Do you see the man talking to the dean（主任）? (与谓语动词同步发生)

· 完成形式：Not having made adequate preparations, they failed. (发生谓语动词之前)

· 完成被动形式：Having been adapted, the script seems perfect. (发生谓语动词之前且表示被动)

2）过去分词

· 过去分词表示被动：Fight no battle unprepared.

· 过去分词的进行形式：You'll find the topic being discussed everywhere. (强调正在被做)

· 这三种非谓语动词，都可以构成复合结构，非谓语动词所修饰的成分是这些非谓语动词的逻辑主语。他们之间的一致关系——主动还是被动，往往就是考点。独立主格结构中，要注意的是分词与他前面的逻辑主语之间的主动被动的关系。

（四）V．+ing形式(现在分词及动名词)

1、形式

1）完成式: 如果要表示动名词代表的动作在谓语所表示的动作之前发生, 通常用动名词的完成形式.

· He didn't mention having met me.

I regret not having taken her advice.

· 在某些动词后(或成语中), 常用动名词的一般形式, 尽管动作是在谓语所表示的动作之前发生的.

Excuse me for coming late.

I don't remember ever seeing him anywhere.

· 现在分词的完成式主要用在状语中, 表示这动作在谓语所表示的动作之前发生.

Having been there many times, he offered to be our guide.

Having found the cause, they were able to propose a remedy.

· 另外, 独立结构也可用现在分词的完成形式.

The guests having left, they resumed their discussion.

The children, having eating their fill, were allowed to leave the table.

1. 被动式: 当一个动名词逻辑上的主语所表示的是这动作的对象时, 动名词一般要用被动形式.

   · His being neglected by the host added to his uneasiness.

He couldn't bear being made fun of like that.

· 但要注意, 在want, need, deserve, require 等动词后, 尽管表示的是被动的意思, 却用动名词的主动形式.My pen needs filling. The point deserves mentioning.

· 在worth这个形容词后情形也是这样.

Her method is worth trying.

· 现在分词的被动式可以用来作定语, 宾语补足语, 状语及用于独立结构中.

This is one of the experiments being carried on in our laboratory.

Being asked to give a performance, she couldn't very well refuse.

These are sold at reduced prices, the defects always being pointed out to the customers.

3）完成被动式: 如果表示的动作在谓语表示的动作之前发生, 有时需要用动名词的完成被动式.

I don't remember having ever been given a chance to try this method.

· 但在多数情况下都避免使用这一形式, 而用一般被动形式代替, 以免句子显得累赘.

· 现在分词的完成被动式一般用来作状语或用于独立结构中.

Having been given such a good chance, how could she let it slip away?

The decision having been made, the next problem was how to make a good plan.

All the compositions having been written and collected, the teacher sent the students home.

2、句法功用

1）作主语:Walking is good exercise. It's nice talking to you.

2）作宾语:Your shoes need polishing. You mustn't delay sending the tractors over.

3）作介词宾语: 动名词作介词宾语用的时候最多. 它常可以用在某些成语后面, 常见的有: insist on, persist in, think of, dream of, object to, suspect…of, accuse…of, charge…with, hear of, approve of, prevent…from, keep…from, stop…from, refrain from, be engaged in, look forward to, opposed to, depend on, thank…for, feel like, excuse…for, aim at, devote…to, set about, spend…in, get (be) used to, be fond of, be capable of, be afraid of, be tired of, be sick of, succeed in, be interested in, feel (be) ashamed of, be proud of, be keen on, be responsible for.

4）作表语: The real problem is getting to know the needs of the people.

· 动名词和不定式都可以作主语或表语. 一般说来, 在表示抽象的一般的行为时多用动名词; 在表示具体某词动作, 特别是将来的动作时, 多用不定式.

5）作宾语补足语: 分词可以在see, hear, notice, watch, feel, find, keep, get, have等动词后作宾语补足语. The words immediately set us all laughing. Once we caught him dozing off in class.

· 在see, hear, feel, watch, notice等动词后, 及可用现在分词, 也可用不定式构成宾语补足语. 用现在分词时, 表示动作正在发生, 用不定式时表示动作发生了.

Do you hear someone knocking at the door? Yes, I did. I heard him knock three times.

6）作状语: 现在分词作状语时, 通常都表示主语正在进行的另一动作, 来对谓语表示的主要动作加以修饰或作为陪衬.I ran out of the house shouting. I got home, feeling very tired.

· 现在分词短语有时可以用作状语表示原因, 相当于一个表示原因的状语从句.

Not knowing her address, we couldn't get in touch with her.

Seeing nobody at home, she decided to leave them a note.

Having already seen the film twice, she didn't want to go to the cinema.

· 现在分词短语有时可用作时间状语, 相当于when引起的从句:

Seeing those pictures, he couldn't help thinking of those memorable days they spent together.

· 如果两个动作是完全同时发生的, 多用when 或while加分词这种结构.

Be careful when crossing the street.

When leaving the airport, they waved again and again to us.

She got to know them while attending a conference in Beijing.

1. 前面带有代词或名词的动名词结构: 一个动名词前面可以加一个物主代词(或名词的所有格结构), 来表示这个动名词逻辑上的主语.

· Their coming to help was a great encouragement to us.

Do you mind my reading your paper?

They insisted on my staying there for supper.

· 如果不是在句子开头, 这个结构常常可以用名词的普通格(或人称代词宾格), 这比用所有格更自然.

I don't mind him going.

She hates people losing their temper.

1. 只能用动名词作宾语的动词: suggest, finish, avoid, stop, can't help, mind, admit, enjoy, leave off, require, postpone, put off, delay, practice, fancy, excuse, pardon, advise, consider, deny, endure, escape, miss
2. 既可用动名词, 也可用不定式作宾语的动词: love, like, hate, dislike, begin, start, continue, intend, attempt, can't bear, propose, want, need, remember, forget, regret, neglect, try, deserve, can't afford等.

   · 有时两种结构之间意义差别不大, 有时却有不同的意思. 在remember, regret, want, try等词后差别是比较明显的.

   I remember seeing her once somewhere.

   I regret not having accepted your advice.

   I regret to say I haven't given you enough help.

   We must try to get everything done in time.

10）悬垂修饰: 分词作状语时, 表示的必须是主语的一个动作或状态.

· Walking through the park, we saw a lot of flowers. (walking是we的动作, 正确)

Standing on the tower, we could see the whole city. (正确)

三、分词

（一）意义: 过去分词通常来自及物动词, 带有被动意义和完成意义; 而现在分词有的来自及物动词, 有的来自不及物动词, 通常带有主动意义和未完成意义.

1、frozen food；a freezing wind；a bored traveler；a boring journey；a lost cause；a losing battle；a conquered army；a conquering army；a finished article；the last finishing touch；the spoken word    ；a speaking bird；a closed shop；the closing hour；a recorded talk    ；a recording machine

2、来自不及物动词的过去分词很少能单独用作前置修饰语, 能作这样用的仅限于下面几个词, 仅表示完成意义, 不表示被动意义.the risen sun, fallen leaves, faded/withered flowers, returned students, retired workers, departed friends, escaped prisoners, the vanished jewels, newly-arrived visitors.

3、用作后置修饰语的过去分词一般都带有修饰语或其他成分, 在意义上相当于关系分句.

Most of the people invited to the reception were old friends.

（二）句法作用

1、作定语: distinguished guest 贵宾, unknown heroes 无名英雄, armed forces武装部队, canned food罐头食品, boiled water开水, steamed bread馒头, stricken area灾区

· 分词还可构成合成词作定语: simply-furnished room陈设简单的房间, clear-cut answer明确的答复, highly-developed industry高度发展的工业, heartfelt thanks衷心的感谢, hand-made goods手工制品, man-made satellite人造卫星

1. 作补足语: 可以带过去分词作宾语补足语的动词有:

1）see, hear, feel, find, think等表示感觉和心理状态的动词.

I saw the students assembled in the hall. We found her greatly changed.

2）make, get, have, keep等表示"致使"意义的动词:

I have my hair cut every ten days. She got her bad tooth pulled out.

Please keep us informed of the latest developments.

3）like, want, wish, order等表示希望, 要求, 命令等意义的动词:

I don't want any of you (to be) involved in the scandal.

He won't like such questions (to be) discussed at the meeting.

3、过去分词短语常用作状语, 修饰谓语, 很多都说明动作发生的背景或情况.

1）Guided by these principles, they went on with the work,

Delighted with her work, they made her the general manager.

2）过去分词短语也可作状语表示原因, 相当于一个表示原因的状语从句.

Influenced by his example, they performed countless good deeds.

3）有时也可说明动作发生的时间, 相当于一个表示时间的状语从句.

This method, tried in areas near Shanghai, resulted in a marked rise in total production.

4）间或也可表示一个假设的情况, 相当于一个条件从句.

Given closer analysis, we can see this is totally wrong.

5）偶尔也可用来代替一个"让步"状语从句.

Picked 20 years a year, it grows tired only after 40 or 50 years.

4、独立结构

1）在用分词短语作状语时, 它逻辑上的主语一般必须与句子的主语一.致. 但有时它也可以有自己独立的逻辑上的主语, 这种结构称为独立结构, 一般表示一种伴随的动作或情况.

He rushed into the room, his face covered with sweat.

2）有时可以表示时间: Late that autumn, his work finished, he prepared to return to his institute.

3）表示原因: Her eyes dimmed with tears, she did not see him enter.

4）条件: All things considered, her paper is of greater value than yours.

四、虚拟语气

（一）情态动词所表达的可能性程度：must/can't à should/shouldn't à might/may (not)

另外两个"类情态词的形式："need/needn't; have to/don't have to

1. 最自然的虚拟状态：由should/would+原型时态（不含时间只含状态）

2、本质上是过去将来时：即，时间固定在过去将来，状态不同：一般、进行、完成、完成进行。这时"虚拟语气"的产生往往是因为我们要表达"本来应该…"（而现在却还没有…）（本来可以…，本来能…）

I should go!    (… but I'm still here!) (一般)

I should be working now!    (进行)

I should have practiced more (than I did)!(完成)

我应该多多练习！（言下之意，现在我练习得不多。）

I shouldn't dream away my time too much!(完成的否定)

(actually I did dream away my time too much!)

It shouldn't have been leaking for such a long time! (完成进行)

I may/might/could have finished! (完成)

3、一些常见的句型中，就会出现这种虚拟语气，而处于从句之中，should 常常被省略掉

· suggest, advise, propose, recommend, plan；

· demand, order, direct, arrange, command, decide；

· require, request；

· think, expect, believe, insist, suspect.

由于他们的含义中包含"建议，假设，应该"这类的含义，所以，由他们引起的从句中，就会包含有should+原型时态构成的虚拟语气。这些动词（以及他们的名次形式，分词形式）引起的从句还有其他的变形：主语从句，表语从句，同位语从句。It's suggested that…；My suggestion is that…；The only suggestion that…；The only suggestion I can give you now is that…

4、一些形容词引起的表语从句中，也会有同样的情况

important；necessary；essential

It's natural；strange；incredible     that

a pity; a shame; no wonder

1. 由lest, for fear that, in case 引起的从句中多使用should
2. 表达与事实相反

· 与现在相反：使用[过去时]：

I wish I were not here! (一般现在à一般过去)

Suppose we were not here.

He loved me as if I were his own son.(一般现在à一般过去)

Hope I weren't always losing things!    (现在进行à过去进行)

If only/If I hadn't been there! (现在完成à过去完成)

What if I hadn't been waiting right here!(现在完成进行à过去完成进行)

常考句型：It's (high) time (that)…; would rather (that)…；这两个从句，只能表达对现在的看法，所以，从句中只有一般过去时。

· 与过去相反：过去完成时；

How nice it is if I had past the test!

How nice it is if I had slept a little more this morning!

· 与将来相反：将来的事情没有发生，所以只能推测。

If it rains tomorrow, we'll have to stay one day more.

不过，由于可以用be to表示将来；所以，虚拟语气中经常出现were to；也是CET-4的常考语法点。

1. 虚拟条件句

· if 部分，做一个与事实相反的假设（所以只有一般过去和过去完成）；

· 主句部分，这是表示基于这个假设的推测，一般使用情态动词would，少数情况下使用could/might/may。

· 注意：两个部分之间，是有逻辑关系，而在两部分的谓语动词时态上，没有必然的联系。

1. 注意，虚拟条件句中的if可以省略，造成were/had提前，产生倒装。
2. 隐含的非真实条件

What would you do with 50 thousand dollar?

How could I be happy without you?

除了条件状语从句之外，原因状语从句也会出现虚拟语气。

· 由in order that, so that引起的从句，肯定的时候可以使用may/might; can/could; 否定的时候，多用shouldn't；whoever, whatever, no matter what引起的从句中，多用may+

（二）that从居中

1、wish, would rather (sooner), had better:

· I wish I were as strong as you.

I wish I had paid more attention to our pronunciation.

I would rather they came tomorrow (you had gone there too).

I had rather (that) you told him than I did.

1. suggest, order, demand, propose, command, request, desire, insist 等动词后的宾语从句:

   · The commander ordered that all civilians (should) be evacuated.

   He asked that he be given an opportunity to try.

   She urged that he write and accept the post.

3、it is desired, it is suggested, it is requested, it was ordered, it was proposed, it is necessary, it is important, it has been decided 等结构后的主语从句中.

· It was arranged that they leave the following week

It will be better that we meet some other time.

4、suggestion, motion, proposal, order, recommendations, plan, idea等后的表语从句和同位语从句:

· His sole requirement is (was) that thy system be adjusted.

（三）在某些句型中

1、it is time that

· It is time that we went (或should go) to bed.

It is high time we (should) put an end to this controversy.

1. as if (though) 引起的从句:

   · They talked (are talking) as if they had been friends for years.

   It seems as if it was (were) spring today.

   He acts (acted) as if (though) he were (was) an expert.

3、以lest, for fear that 和 in case 引起的从句(这时谓语多用 should +动词原形):

· He took his raincoat with him lest it should rain.

He put his coat over the child for fear that (或lest) he should catch cold.

4、以whatever, whoever, no matter what这类代词或词组引起的从句(谓语多用may加动词原形构成):

· Whatever defects he may have, he is an honest man.

Come what may, we will go ahead.        不管发生什么情况, 我们都要干下去.

I accept that he is old and frail; be that as it may, he's still a good politician.

我承认他年老体衰, 然而尽管如此, 它仍是优秀的政治家.

（四）条件

1、虚拟条件句主要有下面两类:

1）表示现在及将来情况(表示纯然假设或实现的可能性不大的情况):

· 谓语主要形式如下(be多用were这个形式):

If I were you, I wouldn't lose heart.

How nice it would be if you could stay a bit longer.

1. 表示过去情况的虚拟条件句(与事实完全相反的假设情况), 谓语主要形式如下:

   从句	主句
   had + 过去分词	would have + 过去分词

   · She would have come if we had invited her.

   If I hadn't taken your advice, I would have made a bad mistake,

   You wouldn't have caught cold if you had put on more clothes.

2、有时候, 条件从句表示的动作和主句表示的动作, 发生的时间是不一致的(如一个是过去发生的, 一个是现在发生的). 这时, 动词的形式要根据表示的时间来调整. 这种句子可以称为错综时间条件句.

· If he had received six more votes, he would be our chairman now.

If we hadn't got everything ready by now, we should be having a terrible time tomorrow.

3、有时假设的情况并不以条件从句表示, 而是通过一个介词短语来表示.

· Without music, the world would be a dull place.

We could have done better under more favorable conditions.

But for the storm, we should have arrived earlier.

4、如果条件句从句中包含有 were, had, should 或could, 有时可把if省略掉, 并把were, had, should或could放在主语前面.

· Had we made adequate preparation, we might have succeeded.

Should there be a flood, what should we do?

Were it not for their assistance, we would be in serious difficulty.

五、介词

（一）合成介词和复杂介词

1、合成介词: inside, into, onto, out of, outside, throughout, upon within, without

2、复杂介词: according to, along with, apart from, as for, as to, because of, by means of, in front of, in spite of, instead of, in accordance with, on account of, on behalf of, owing to, due to, together with, up to, with regard to, prior to等

（二）介词在句末:

1、This is what he is interested in.

2、Does everyone has a seat to sit on?

（三）名词加介词 ( n + prep)

1、某些名词之后要求用某些介词: solution to, faith in, glance at, need for

2、某些名词之前要求用某些介词: on one's guard, at one's request, in all probability, to my delight

（四）动词加介词

1、Vi. + prep.: prevail on, appeal to, fall into, apply for, touch upon

2、Vt. + O + prep.: lay emphasis on, take advantage of等

3、Vi. + adv. + prep.:

· I don't wish to break in on your thoughts.

The family came up against fresh problems.

You're not telling me the whole story. You're holding out on me.

She got off with him soon after she began to work at the institution.

4、Vt. + O + adv. +prep.: You shouldn't take your resentment out on me.

（五）形容词加介词

1、about——anxious, careful, careless, certain, considerate, enthusiastic, guilty, happy, mad, particular, sad, sure, timid, unhappy, etc

2、at——awkward, bad, clever, disappointed, disgusted, good, marvelous, quick, skilful, skilled, useless, weak, etc

3、for——convenient, eligible, grateful, homesick, hungry, necessary, noted, perfect, responsible, etc

4、from——evident, exempt, inseparable, safe, tired, etc

5、in——deficient, expert, liberal, quick, rich, successful, weak, etc

6、of——apprehensive, characteristic, critical, destructive, envious, hard, inconsiderate, impatient, dependent, jealous, positive, scared, sensible, short, sick, suspicious, typical, worthy, etc

7、on——dependent, keen, intent, etc

8、to——acceptable, accessible, agreeable, alive, attentive, blind, comparable, courteous, deaf, destructive, essential, favorable, hostile, indifferent, married, obedient, parallel, preferable, related, responsible, sensitive, suitable, unjust, etc

9、with——awkward, bored, careful, disappointed, generous, identical, ill, impatient, popular, sick, wrong, etc

六、连词

（一）并列连词

1、表示意义的引申: and, both…and, not only…but(also), as well as, and …as well, neither…nor

2、表示选择: or, either…or

3、表示转折: but, while, whereas, yet, however/nevertheless(也可认为是副词)

4、表示因果: for, so, therefore, hence

（二）从属连词

1、表示时间: when, while, as, after, before, since, until(till), as soon as, once

2、表示原因: because, as, since, now that, seeing that

3、表示条件: if, unless, in case, provided(that), suppose, as long as, on condition (that),

4、表示其他关系: (al)though, than, as/so…as, lest, in order that, so…that

七、定语从句

（一）限制和非限制性定语从句

1、限制性定语从句是名词词组不可缺少的一个组成部分, 去掉了会造成病句或意义不明确; 非限制性定语从句属于补充说明性质, 去掉了不会影响主要意义, 通常用逗号与它的先行词分开.

· The boys who wanted to play football were disappointed when it rained.

The boys, who wanted to play football, were disappointed when it rained.

2、如果定语从句的先行词是专有名词, 或是带有形容词性物主代词(my, his, etc)或形容词性指示代词(this, that, etc)作限定词, 其后的定语从句通常都是非限制性的:

· Mary Smith, who is in the corner, wants to meet you.

Her mother, who had long suffered form arthritis, died last night.

4、在非限制性定语从句中只能用who/whom指人, 用which指物,通常不用that替代.

· My father, who had been on a visit to America, returned yesterday.

All the books, which had pictures in them, were sent to the little girl.

（二）定语从句的引导词

1、that, who, whom

1）非限制性定语从句, 如果修饰人, 一般用who, 有时用that (作主语时用who较多). 如果关系代词在从句中作宾语, 就应当用宾格 whom 或that, 但在大多数情况下都可以省略掉, 在口语中可用who代替whom.

· Here is the man (whom) you've been looking for.

He is a man (that) you can safely depend on.

The people (who/that) you were talking to were Swedes.

2）但在介词后只能用whom:

· This is the man to whom I referred.

3）但在口语中一般都把介词放到句子后面去, 这时可用that, 但省略时更多一些.

· Have you met the person about whom he was speaking?

Have you met the person (that) he was speaking about

The girl to whom I spoke is my cousin.

The girl (who/that) I spoke to is my cousin.

1. 限制性定语从句如果修饰"物", 用关系代词that的时候较多, 也有时用which.当这个代词在从句中是用作宾语时, 在绝大多数情况下都是省略的, 特别是口语中(尤其是当被修饰的词是all, everything等词时):

   1）Have you everything you need?

   (Is there) anything I can do for you?

2）在介词后只能用which, 在口语中一般都把介词放到从句后部去, 这时可以用that, 但省略的时候更多一些:

· The tool with which he is working is called a wrench.

The tool (that) he is working with is called a wrench.

This is the question about which we've had so much discussion.

3）定语从句一般是修饰名词或代词的, 但间或也可以修饰整个句子a), 或是句子的一部分 b), 引导词用which:

· They have invited me to visit their country, which is very kind of them.

The activity was postponed, which was exactly what we wanted

· When deeply absorbed in work, which he often was, he would forget all about eating and sleeping.

She was very patient towards the children, which her husband seldom was.

3、whose: 在表示"．．．的"这个概念时, 可用所有格 whose; whose 用于指物, 有时可与of which交替使用, 通常的词序是 名词词组 + of which:

· Is there anyone in your class whose family is in the northeast?

We had a meeting whose purpose was completely unclear. (…the purpose of which was…)

He's written a book the name of which I've completely forgotten. (…whose name I've…)

of which前的名词词组也可以由some, any, none, all, both, several, enough, many, most, few以及基数词担任; 这些词也能用在 of whom之前.

The buses, most of which were already full, were surrounded by an angry crowd.

It's a family of eight children, all of whom are studying music.

4、关系副词 when, where, why: 它们的含义相当于 at which, in which, for which, 因此它们之间有交替使用的可能.The day when he was born…；on which he was born…；which he was born on…；The office where he works…；at which he works…；which he works at…

1）有时可用that替代关系副词, 在口语中that 可省略.

Every time (that) the telephone rings, he gets nervous.

This was the first time I had serious trouble with my boss.

Do you know anywhere (that) I can get a drink?

This is the place (where) we met yesterday.

That is the reason (why) he did it.

2）在the way 后也可用that 替代in which, 在口语中that也可省略.

This is the way (that/in which) he did it.

That's the way I look at it.

（三）如果定语从句中谓语为 there is, 作主语的关系代词也常可省掉:

1、I must make full use of the time there is left to me and do as much as I can for the people.

2、This is the fastest train (that) there is to Nanjing.

（四）定语从句的简化: 定语从句与不定式结构, -ing分词结构, -ed分词结构以及无动词分句等有着转换关系.

1、He was the only one to realize the danger (= who realized the danger).

2、The man injured by the bullet (= who was injured by the bullet) was taken to hospital.

3、All the women present (= who were present) looked up in alarm.

八、倒装

（一）全部倒装和部分倒装

1、如果谓语在主语前面, 就是倒装语序. 倒装语序又分为全部倒装和部分倒装. 在全部倒装的句子中, 整个谓语都放在主语的前面: Here are some registered letters for you.

2、在部分倒装的句子中只是谓语中的一部分(如助动词, 情态动词, 或系动词be等)放在主语前面, 其余部分仍在主语后面:

· Under no circumstances must a soldier leave his post.

I couldn't answer the question. Nor could anyone else in our class.

Only in this way is it possible to accomplish the above-mentioned glorious task.

（二）以neither, nor, so等开始的句子

1、由so引起的表示前面所说情况也适用于另一人(或东西)的句子(肯定句), 由neither, nor引起的表示前面所说情况也适用于另一人(或东西)的句子(否定句), 助动词或be置于主语前.

· "We must start for the work-site now". " So must we."

I am quite willing to help and so are the others.

He didn't drop any hint. Nor (Neither) did his secretary.

"I won't do such a thing." "Nor (Neither) will I."

2、如果一个句子只是重复前面一句话的意思, 尽管是用so开头, 语序也不要颠倒.

· "It was cold yesterday." "So it was."

"Tomorrow will be Monday." "So it will."

（三）当句首状语为 never, little, not only, not until, hardly, scarcely等否定词或有否定意义的词语时, 一般引起部分倒装.

1、No longer are they staying with us.

2、No sooner had he arrived there than he fell ill.

3、Under no circumstances could I agree to such a principle.

（四）表示位置或方向的副词提前, 谓语动词为 go, come等表示位置转移的动作动词而主语又较长时, 通常用全部倒装:

· There was a sudden gust of wind and away went his hat.

The door burst open and I rushed the crowd.

There comes the bus! Now comes your turn.

1、如果主语是代词, 仍用正常语序:

· There comes your turn.

2、有here引起, 谓语为be的句子, 也要倒装:

· Here is China's largest tropical forest.

Here are some picture-books.

3、如果主语是代词, 仍用正常语序:

· Here we are. This is the new railway station.

"Give me some paper." "Here you are."

（五）表语和系动词提前:

1、介词短语

· On the other side was northern Xinjiang.

Near the southern end of the village was a large pear orchard.

1. 形容词

· Very important in the farmer's life is the radio weather report.

Worst of all were the humiliations he suffered.

1. 副词

· Below is a restaurant.

Southwest of the reservoir were 2,000 acres of sandy wasteland.

1. 分词

· Housed in the Cultural Palace are a library, an auditorium and recreation rooms.

Hidden underground is a wealth of gold, silver, copper, lead and zink.

Standing beside the table was an interpreter.

5、句首状语若由 only + 副词, only + 介词词组, only + 状语从句构成, 引起局部倒装:

· Only yesterday did he find out that his watch was missing.

Only through sheer luck did he manage to get some tickets.

Only because there were some cancelled bookings did he get some tickets in the end.

· 有not only开头的句子或分句, 往往引起局部倒装:

Not only did he complain about the food, he also refused to pay for it.

Not only did the garage overcharge me, but they hadn't done a very good repair job either.

九、比较级和最高级

（一）无比较级和最高级的形容词及副词: complete, perfect, utter, etc

（二）比较从句

1、as…as, almost/just/nearly as…as, not so/as …as:

· We'll give you as much help as we can.

I haven't made as much progress as I should.

We've produced twice as much cotton this year as we did ten years ago.

My command of English is not half so (as) good as yours.

1. than, so much/a lot more than, no more… than, not more…than, less than，more…than, less…than可表示"与其说…不如说…":

   · He is more good than bad.

   He was less hurt than frightened.

   The present crisis in capitalist countries is much more a political than an economic crisis.

   3、"no + 形容词或副词比较级 + than"所表示的可以是该形容词或副词的相反的含义:

   1）no rich than = as poor as；no bigger than = as small as；no later than = as early as；

   John is no better than Tom.

I have taken no more than six courses this semester.

1. the more… the more (越是…就越…)

   · Actually, the busier he is, the happier he feels.

   The more they talked, the more encouraged they felt.

3）more of a, as much of a, less of a, etc: 当as much of a…as, more/less of a …than等结构与单数可数名词搭配时, 名词只能置于比较结构中间.

· He is more of a sportsman than his brother.

十、名词性从句: 名词性从句包括主语从句, 宾语从句, 表语从句, 同位语从句.

（一）主语从句有三类:

1. 由what等代词引导的主语从句: what表示"…所…的(东西)", 在结构上等于一个名词加一个定语从句; whatever表示"所…的一切"; whoever表示"一切…的人".

   · What you need is more practice

   What is hard is to do good all one's life and never do anything bad.

   Whatever was said here must be kept secret.

   Whatever I have is at your service.

   Whoever fails to see this will make a big blunder.

2、由连词that引起的主语从句: 这类主语从句在大多数情况下都放到句子后部去, 而用代词it做形式上的主语:

· That we need more equipment is quite obvious.

It is impossible that I may not able to come.

It doesn't seem likely that she will be here.

· 在口语中连词that有时可以省略掉:

It's good you're so considerate.

It's a pity you missed such a fine talk.

3、由连接代词或连接副词(或whether)引起的主语从句: 这类主语从句, 也可以放到句子后部去, 前面用it做形式上的主语.

· When we shall have our sports meet is still a question.

It is still a question when we shall have our sports meet.

Whether he will join us won't make too much difference.

It won't make too much difference whether he will join us.

（二）宾语从句: 和主语从句及表语从句一样, 宾语从句也有以上三类.

1、连接代词或副词引导的从句只是在某些动词后能用作宾语.

· Tell me what you want.

I just can't imagine how he could have done such a thing.

Have you decided whom you are to nominate as your candidate.

2、能跟这类宾语从句的常见动词有: see, say, tell, ask, answer, know, decide, find out, imagine, suggest, doubt, wonder, show, discover, discuss, understand, inform, advise等. 这种动词后也常用whether或if引导的从与作宾语:

· I don't know whether these figure are accurate. I'm wondering if the letter is overweight.

3、这种从句有时前面可以有另一个宾语:

· Has she informed you when they are to hold the meeting?

Please advise me which book I should read first.

4、有时这种从句也可用作及词的宾语:

· Whether that is a good solution depends on how you look at it.

He was not conscious of what an important discovery he had made.

I was curious as to what he would say next.

5、用that引导的从句作宾语的情形最为普遍, 在很多动词如boast, say, think, insist, wish, hope, suppose, see, believe, agree, acknowledge, admit, deny, expect, explain, confess, order, command, suspect, dream, suggest, propose, know, mean, notice, prefer, request, require, report, urge, 以及doubt的否定和疑问式后面都可以用它.

十一、情态动词:

（一）用"情态动词＋have ＋done"结构表示对过去动作的推测，高考试题中常用过去时态或过去的时间状语给以暗示。情态动词的这一用法可以用 "对立统一"来概括。

1、当试题的前句和后句在动作和意义上相互补充说明，且整个句意在动作和时间上是一个整体时，我们可用"统一"关系来解决这样的试题。常见的结构有：

1）must have done：表示对过去动作的肯定推测，常译作"一定做了……"，只能用于肯定句中。其否定形式为can't／couldn't have done

2）疑问式为Can／Could...have done﹖；could ／might have done：表示对过去发生的动作的可能性推测，常译作"可能做了……"。如：

· My sister met him at the Grand Theater yesterday afternoon, so he your lecture． 

A. couldn't have attended B. needn't have attended

C. mustn't have attended D. shouldn't have attended 本题选A。

· Jack ＿＿＿＿ yet, otherwise he would have telephoned me．

A. mustn't have arrived B. shouldn't't have arrived

C. can't have arrived D. need not have arrived （C）

2、当试题的前后句在动作和意义上构成转折关系时，常借助"but, however，instead"等词来表示过去的动作与客观事实不符，这时我们就可以用"对立"关系来解决这样的试题。这种结构常见的有：

1）should have done/ought to have done：表示过去本应该做某事而实际上没有做。

2）should not have done/ought not to have done：表示过去本不应该做某事但事实上却做了。

3）need have done：表示过去本来有必要去做某事，但事实上没有做。

4）need not have done：表示过去本来没有必要做某事，但事实上却做了。如：

· I was really anxious about you． You home without a word．

A．mustn't leave B．shouldn't have left

C．couldn't have left D．needn't leave （"本不应该离家出走却走了"，故本题选B。）

· I told Sally how to get here, but perhaps I for her．

A．had to write it out B．must have written it out

C．should have written it out D．ought to write it out

[解析]由句中的连词but可知前后句之间是对立关系，分析题意可知本题应选C。

（二）考查情态动词基本用法之间的比较和辨析。最近几年高考试题中常借助具体的语境来考查考生对那些最常见的情态动词的基本用法的理解和掌握，因此在做这样的试题时应认真分析语境中所含的实际意义，并结合情态动词的基本含义和用法做出正确的选择。

· —Is John coming by train﹖

—He should, but he ＿＿＿＿＿＿ not． He likes driving his car．

A．must B．can C．need D．may

[解析]mustn't 表示"禁止、不准"；cannot 表示"不可能"；need not 表示"不必要"；may not 表示"可能不"。分析语境可知本题应选D。

· Mr. Bush is on time for everything．How it be that he was late for the opening ceremony？

A．can B．should C．may D．must

[解析]must be 表示肯定的猜测，只能用于肯定句中，由题意可知本题应选A。

· —Are you coming to Jeff's party﹖

—I'm not sure． I go to the concert instead．

A．must B．would C．should D．might

[解析]由题意和下句中的 "I'm not sure" ，可知这段对话中存在一种可能性推测，might可以用来表示一种比较委婉的可能性判断，故本题选D。

· I should have been there, but I not find the time．

A．would B．could C．might D．should

[解析]分析题意可知第二个分句表示过去的某种能力；C 项只表示语气上的可能性，与题意不符。选B。

· —Could I borrow your dictionary﹖

—Yes, of course you ．

A．might B．will C．can D．should (选C)

· —When can I come for the photos﹖ I need them tomorrow afternoon．

—They be ready by 12：00．

A．can B．should C．might D．need

[解析]该题考查情态动词should的基本含义，分析句意可知本题应选B。又如：

· The fire spread through the hotel very quickly but everyone get out．

A．had to B．would C．could D．was able to

[解析]该题考查了could和be able to的区别，二者都可表示过去时间的能力，但如果表示过去成功地做了某事只能使用was/were able to do，故本题选D。

（三）may/might表示允许和可能:

1、允许: 询问或说明一件事可不可以做.

·May I trouble you with a question? You may take this seat if you like.

You might as well speak your mind. (比may…显得婉转一些)

1. 可能: 表示一件事或许发生(或是某种情况可能会存在).

   · You may walk ten miles without seeing a house. She was afraid they might not like the idea.

   1. might 表示请求：Might I ask for a photograph of your baby? (比May I …更客气一些)

（四）can't, couldn't表示否定的推测:

1、She can't be serious.

2、A more suitable book can't be found. (It is not possible to find a more suitable book.)

3、He couldn't (can't) be over fifty.

（五）should, ought to: 表示应该做的事, ought to比should口气稍重一些.

· You should (ought to) do as he says.

You shouldn't (oughtn't to) talk like that.

1、但这两者间也有一些差别, 在表示责任, 义务等该做的事情时, 用ought to, 在表示某件事宜于做时, 多用should, 在下面的句子中这两个词就不宜换用:

· You are his father. You ought to take care of him.

We should not use too many big words in our everyday speech.

2、will, would

3、shall, should表示意愿

4、情态动词后接进行式, 完成式和完成进行式:

1）情态动词可以和动词的进行式构成谓语, 表示"应该正在…", "想必正在…"这类意思:

· Why should we be sitting here doing nothing?

This isn't what I ought to be doing.

She might still be thinking about the question you raised.

They must (may) be waiting for us, let's hurry up.

1. 情态动词有时和动词的完成形式构成谓语, 表示"应当已经…", "想必已经…"这类意思:

   · I should have thought of that.

   They shouldn't have left so soon.

   You needn't have told them that.

   Where can (could) he have gone?

   He may not have achieved all his aims. But his effort is praise-worthy.

2. 情态动词间或也可以和一个动词的完成进行式构成谓语,表示"应当一直在…", "想必一直在…"这类意思:

   · They are sweating all over. They must have been working in the fields.

   They may have been discussing the problem this morning.

   You should have been waiting for us. Why haven't you?

   She couldn't have been swimming all day

十二、倒装

（一）全部倒装：是只将句子中的谓语动词全部置于主语之前。此结构通常只用与一般现在时和一般过去时。常见的结构有：Up went the plane = the plane went up.

1、here, there, now, then, thus等副词置于句首, 谓语动词常用be, come, go, lie, run。

2、表示运动方向的副词(back, down, off, up)或地点状语置于句首，谓语表示运动的动词。

· 上述全部倒装的句型结构的主语必须是名词，如果主语是人称代词则不能倒装。Here he comes.

· 谓语动词是be的时候，不能倒装。 Here it is. Here you are.

· 形容词短语/分词短语位于句首，引起倒装。typical of；characteristic of；coinciding with + n.

· 表示地点范围的介词短语位于句首，谓语动词为系动词，一定引起倒装。In…（表语）+系动词+主，主同；在倒装句型答案中不能出现there；常考介词要倒装：among，between，in，at，beneath；常考的系动词：be，lie，exist，remain，rest

（二）部分倒装

1、否定 adv 位于句首，引起倒装：

1）not only, not until, hardly, scarcely, seldom, rarely, no sooner…than　

2）not until + 时间 + 主谓倒装，not until + 句子+主谓倒装

3）only+状语位于句首：only +ad.；prep.短短语；从句；only一个词本身不倒装

2、在比较级结构中，than后面可以倒装，也可以不倒装。 

1）部分倒装是指将谓语的一部分如助动词或情态倒装至主语之前。如果句中的谓语没有助动词或情态动词，则需添加助动词do, does或did，并将其置于主语之前。

2）Neither, nor, so 表示前面句子的共同否定或者肯定，产生倒装，一般主动词提前

3、as / though引导的让步从句必须将表语或状语提前 （形容词, 副词, 分词, 实义动词提前）。

1）as〔让步〕虽然，尽管〔词序倒装。语气比 though 强〕。

· Successful as he is, he is not proud. 他虽成功，却不骄傲。

Try hard as he will, he never seems able to do the work satisfactorily.

2）注意：A) 句首名词不能带任何冠词。B) 句首是实义动词, 其他助动词放在主语后。如果实义动词有宾语和状语, 随实义动词一起放在主语之前。

4、其他部分倒装

1）so… that 句型中的so; such… that句型中的such位于句首时，需倒装。

2）So frightened was he that he did not dare to move an inch.

3）在某些表示祝愿的句型中：May you all be happy.

4）在虚拟语气条件句中从句谓语动词有were, had, should等词，可将if 省略，把 were, had, should 移到主语之前，采取部分倒装。Were I you, I would try it again.

十三、复合句

（一）从句可分为：

1、名词性从句à 主语从句、宾语从句、表语从句、同位语从句

2、形容词性从句à定语从句

3、副词性从句à状语从句

4、常考的关系代词：that；which；who/whom/whose；where；when；what；as。

5、常见的同位语从句现行词（that之前的抽象名词）：fact, idea, news, hope, conclusion, evidence, opinion, problem, thought, understanding…

1. 常用的引导词

   · 时间状语从句：while，when，before，whenever，as，after，till，until，since，once，ever since， as/so long as，as soon as，no sooner… than，hardly… when， scarcely/barely… when，the moment/minute/instant，on (the point of) doing…

· 地点状语从句：where，wherever

· 原因状语从句：because，since，as，seeing that，considering that，now/in that，for fear that，lest，owing to the fact that，because of，the fact that，due to，the fact that…

· 方式状语从句：as，as if，as though，how，save that…

· 比较状语从句：as，than，as… as，not so… as，hardly… than

· 结果状语从句：so that，so… that，such… that，so as to…

· 条件状语从句：if，unless，in case，so long as，so far as，provided/providing/that，supposing， granted/granting that…，giving that….

· 让步状语从句：though，although，even if，even though，heather，as，however，no matter (what, how, when)，for all that，in spite of the fact that，granted that，regardless of the fact that…

· 目的状语从句：that，so that，in order that，lest，for the fear that，in case…

（二）、定语从句:

1）which 引导的定语从句结构

· which是关系代词，which后面应该加缺主语或者宾语的句子，在这个句子中，which要作成分，作主语或者宾语

2）in which+完整的句子，which在定语从句中作in的宾语，所以不能作后面句子的主语

3）名词+of which+谓语动词，of which来修饰名词，名词在定语从句中作主语，所以后面直接跟谓语动词

I have five books three of which are borrowed from Mary.

4）介词+ which +to do 其功能相当于定语从句。The key with which to open the door is lost.

5）定语从句的省略结构：

· 如果that / which在定从中作 宾语，可以省略.

sub.+ vt.+ n.+ (which / that) + sub.+ vt.→s.+ vt.+ n.+ s.+ v.

· 当做题时，若发现两个名词在一起，但是似乎连不上，则一定省略that/which，则动词为vt，做谓语。 
6）定从的特殊省略

· the way (in which) + 句子

· the reason (why that)+句子　　　　　　　

· the time (that / when)+句子

· By the time省that+句子，句子。

7）定从的主系省略（主+系可同时省） 即：which be , who be , that be可同时省状语从句省略结构。这种省略从句主语的方式理论上需要满足以条件：①特定的状语从句引导词：although，though，even，though，when，while，if，as；②从句主语和主句主语必须保持一致；③从句的谓语必须是be动词，主语和be动词同进同出。

文章来源：刘俊涛的博客

欢迎关注，有问题一起学习欢迎留言、评论