以下为课件内提取的文本内容，仅供参考：

Modal Verbs

Can, may, must, should

表能力　I can speak English.

　　　　He could swim when he was 6 years old.

表允许，表许可

Can (Could) I borrow you book?

Yes, you can (may).

No, you can’t (mustn’t).

表推测,可能性（疑问句，否定句）

对现在状态，现在正在进行的动作的推测

Can (Could) the news be true?

The news can’t ( couldn’t) be true because it is not

from an authority.

He can’t (couldn’t) be reading in the reading room,

for I saw him in the street just now.

过去事实的推测

The road isn’t wet. It can’t (couldn’t) have rained last night.

I don’t know why she didn’t’ call me yesterday. Can (could)

she have forgotten my telephone number?　　　

can

有时态区别

没时态区别，表语气委婉

没时态区别，表可能性大小

表请求，表许可　　May I have a talk with you?

Yes, please./ Certainly./ Yes, of course./ Sure

No, you can’t. No, you mustn’t.

表推测，可能性（肯定句，否定句）

对现在状态，现在正在进行的动作的推测

　She is walking towards us. She may (might) be our new teacher.

　Where is Tom? He may (might) be having breakfast.

　过去事实的推测

Where was Marry last night?

She may (might) have gone to the library or she may (might)

　 have gone to watch the football match.

表祝愿

May you succeed.

May you have a nice and wonderful vacation.

May

没时态区别，表语气委婉

没时态区别，表可能性大小

表必须，一定要　Everybody must obey the rule.

You mustn’t park your car at the entrance.

表允许，表许可 Must I clean the classroom now?

Yes, you must.

No, you needn’t. /No, you don’t have to.

表推测，可能性（肯定句，）

对现在状态，现在正在进行的动作的推测

　He must be in his office for he called me from there 5

minutes ago.

You must be feeling cold with only a shirt on.

　过去事实的推测

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

I didn’t hear the phone. I must have been asleep.

Must

You ought to respect your parents

You ought not to read in the sun.

表应该，有责任，有义务

We should encourage him for we are his classmates.

We should help each other.

Ought to

Should

Could, should

表批评，责备

　　should have done 　 应该做而没有做

＝ought to have done

shouldn’t have done　　不该做而做了

You should have gone over your lessons.

(In fact you didn’t go over your lessons.)

You shouldn’t have watched TV last night.

(In fact you watched TV last night.)

Could have done　　　　有能力做而没有做

I could have run 100 meters in twelve seconds.

should

居然，竟然，表惊讶，吃惊

You can’t imagine that a well-behaved gentleman should be so rude to a lady.

Should 在虚拟语气里的个别用法

1. insist, suggest, demand + that sb (should) do sth.

order, request, command

2. His suggestion, order, is that sb (should) do sth.

request, proposal, idea

3. It is suggested that sb (should) do sth.

ordered

demanded

4. It is necessary that sb (should) do sth.

(important/ natural/ strange/ surprising/ impossible)

It is a great pity that sb (should) do sth

It will be better that sb (should) do sth.

1. You return the book now. You can keep it till next week if you like.

A. can’t B. mustn’t

C. needn’t D. may not

2. Where is my pen? I it.

might lose B. would have lost

C. should have lost D. must have lost

3. I didn’t hear the phone. I asleep.

must be B. must have been

C. should be D. should have been

C

D

B

4. He you more help, even though he was very busy.

might have given B. might give

C. may have given D. may give

5. Without electricity human life quite difficult today.

is B. will be

C. would have been D. would be

6. A computer think for itself, it must be told what to do.

can’t B. couldn’t

C. may not D. might not

7. Janny have kept her word. I wonder why she changed her mind.

must B. should

C. need D. would

A

B

A

B

8. We last night, but we went to the concert instead.

must have studied B. might study

C. should have studied D. would study

9. –Could I borrow your dictionary?

-Yes, of course you .

might B. will

C. can D. should

10. Tom ought not to me your secret, but he meant no harm.

have told B. tell

C. be telling D. having told

C

C

A