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unit 1 情态动词

Lesson 17

Alway young


She must be at least thirty-five years old.


Jennifer will have to take part in a new play


In the play, she must appear in a bright red
dress and long black stockings. Last year in another play, she had to wear short socks and a bright, orange-coloured dress. 'Darling, it must be terrible to be grown up!'



Lesson 19

Sold out

? ? ? ? ?

'The play may begin at any moment.' 'It may have begun already.' 'May I have two tickets please?' 'Can I return these two tickets?' 'Could I have those two tickets please?'


'I might as well have them.'

Lesson 41

Do you call that a hat?


'You needn't be so rude about it.'
'We mustn't buy things we don't need.'


'You needn't have said that,' my wife answered. 'I needn't remind you of that terrible tie you bought yesterday.'
'I find it beautiful,' I said. 'A man can never have too many ties.' 'And a woman can't have too many hats,' she answered.



核心语法1:must与have to 必须


? must+do

Cinderella must leave the ball before twelve o 'clock.

must > may 他一定是一个傻瓜。 He must be a fool. =I personally think he is a fool.


must + have 对过去事情的肯定猜测

The road is wet. It must have rained last night.


? 在表示义务和责任时,must和have


公立学校必须遵循国家课程。 State schools must follow the National

State schools have to follow the

National Curriculum.

I must tidy up the room.(主观想法)
I have to tidy up the room.(客观想法)



don’t have to:“不必”,

must not/mustn’t:“不准”,“禁止”
I don’t have to finish my homework now. I can do it at the weekend. 我不必现在就完成作业,我可以等周末做。 You mustn’t arrive late or you’ll get into trouble. 你千万不能迟到,否则会陷入麻烦的。

must:只有一种时态 have to:有不同的时态变化 I have to leave now. I had to leave yesterday.

I shall have to leave now.

核心语法 2 In spite of this,she often appears on the stage as a young girl.

1)because 因为... I cannot come as I am busy. 2)at the time when 当...时候 As I was leaving the house,the postman

brought a letter.

3)the thing that 依照,像...一样 Do as you are told.

4)in the position of 担任,作为
He works as an engineer.

(08全国卷I) 24、Let’s learn to use the problem we are facing _____ a stepping-stone to future success. A. to C. as B. for D. by

核心语法1 can may could might

can - could(can的过去式)
Mary can speak three languages. Can you lift this heavy barbell?

2)表示客观可能性 She can't be serious. 她不可能是认真地。 The theater can seat 2500 people. (客观原因形成的能力)

3)表示请求、允许(和may相近) Can I come in?(英) May I come in?(美) 4)表示怀疑,惊异等态度(否定句、疑问 句,惊叹句) No,no,this can't be ture. How can you be so careless.


may - might(may的过去式)


May I trouble you with a question?
2)表示一件事可能会发生或某情况可能存在 He may be engaged now.


Write to him at once so that he may know in time.

May that day come soon.




Could I see you licence.(更委婉)
Can I see you licence.

表示可以做的事情或可能发生的事,更客气 Might I ask for a photograph of your baby?

You might as well speak your mind.
might as well / may as well

核心语法1 must、need、have to


2)否定:need not或don't have to

don't have to:没必要

只能用 have to do sth I didn’t go to see you this morning because I had to go to the hospital.



have to,should,ought to)
Need you go so soon?

Yes,I must./No,I needn't.


也可用于又否定意思的肯定句中(no, hardly)

Now there need be no arguments about this question. 关于这个问题没有必要争论。


need sth/doing/to do
You don't need to do it yourself. I need a large house. The room needs cleaning.


not need to 更正式


He doesn't need to be told.(他已经知道)

He needn't be told.(告诉他没用或没好处)

shall 1) shall 用于主语是第一人称或第三人称的疑问句 中,表示说话人向对方提出建议,或征求对方的 意见。
? ?

Shall we go there by bus? Shall he attend the meeting too?

1)表示应该,义务 We should work harder. 2)对已经发生的事表示责备should+have+ 过去分词

You should have waited for us.

3)表示逻辑推测 They left two hours ago and they should have arrived home now. 他们是两个小时前离开的,此时该到家了。
? ?

should推测是根据逻辑规律进行判断, can,may,must是根据客观事实进行判断

John must be sick for he looks pale. 约翰肯定病了,因为他脸色苍白。 John should be able to answer the question for he is a clever boy. 约翰肯定能回答这个问题因为他很聪明。


should+be+现在分词 过去:should+have+过去分词 I did not expect that you should have finished the work so soon. 我没想到你竟会如此快的完成这个工作。

2) shall 用于主语是第二、三人称陈述句中, 表示说话人的允诺和警告。

You shall be sorry for what you have done.


You shall not leave your post this



We will do our best to get the job done in time. 我们会尽最大努力如期完成这项任务。

Will you please be quiet?

表示“意愿”“请求”,比will更委婉、 含蓄 ? Would you please look after my flowers while I am away? 我不在的时候,请你帮忙照料一下我的花 好么? ? We invited him to the party but he wouldn't come. 我们邀请他参加晚会但是他不愿意来。

1)情态动词(用于否定、疑问句、条件从句中) How dare you speak to me like that? 你怎么敢那样对我说话? She dare not mention the subject again. 她不敢重提那个话题。 2 )做实意动词后加不定式 I have never dared to tell him about it. 3) "I dare say"是习惯用语,意为“我猜想” I dare say you are right.我认为你是对的。

情态动词+不定式完成式(have done)
1) can / could + have done
在肯定句中表示“本来可以做而实际没做”, 是虚拟语气;在疑问句或否定句中表示对过去 行为的怀疑或不肯定, 表示推测。

You could have done better, but you didn’t try your best. (虚拟语气) He can’t have been to that town.(推测)

? ?

Can he have got the book?(推测)

2) may / might +不定式完成式(have done) 表示对过去行为的推测。不能用于疑问句中,没 有虚拟语气的用法。 ?He may not have finished the work .

?If we had taken the other road, we might have

arrived earlier.我们也许会到的更早些

3)must +不定式完成式(have done) 用于肯定句中,表示对过去行为的推测。 意为“一定、想必”。其疑问、否定形 式用can,can’t代替。
? ?

You must have seen the film Titanic. He must have been to Shanghai.

4)should +不定式完成式(have done)

He should have finished the work by now。

发生却发生了。 可以与ought to +不定式完成式(have done)互换。

You ought to / should have helped him. (but you didn’t.)

5) needn’t +不定式完成式(have done)

You needn’t have watered the flowers, for it is going to rain. 6) will +不定式完成式(have done)
主要用于第二、三人称,表示对已完成的动作 或事态的推测。

He will have arrived by now.


27、When I was young, I was told that I ______ play with matches
A. wouldn’t C. mustn’t B. needn’t D. daren’t

2009年全国卷 25. What do you mean, there are only ten tickets? There______ be twelve. A. should B. would

C. will

D. shall

2006全国二 10.We hope that as many people as possible _________ join us for the picnic tomorrow. A.need B.must C.should D.can

2006全国二 17. Liza ___ well not want to go on the trip --- she hates traveling. A. will B. can

C. must

D. May


24、Thank you for all your hard work last week. I don’t think we ______ it without you.
A. can manage

B. could have managed
C. could manage

D. can have managed

(08江西卷) 26、What a pity. Considering his ability and experience, he ____ better. A. need have done B. must have done

C. can have done

D. might have done

(08陕西卷) 09、–What sort of house do you want to have? Something big? --Well, it ____be big,that’s not important. A. mustn’t B. needn’t

C. can’t

D. won’t



? ?

(09重庆)9. —Hi, Tom. Any idea where Jane is? —She_____in the classroom. I saw her there just now. A. shall be B. should have been C. must be D. might have been




(09四川)7. —I don’t care what people think. —Well, you _______ A. could B. would C. should D. might




(09湖南)4.— It’s the office! So you ---- know eating is not allowed here. — Oh, sorry. A. must B. will C. may D. need

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