一、情态动词的基本用法
1.can / could
(1)She can drive，but she can’t ride a bicycle.
(2) “Can/could I use your telephone？”“Yes，of course you can.”
You can’t park your car in this street.
Can/ could you give me a lift to the station?
Can’t you lend me ten dollars？
(3)Jogging can be harmful to the health.
(4) He can't be at home now ,for he has gone to America 2days before
where can I have put my phone? I can't have lost it
He can't/ couldn't have slept well last night, for he was preparing for the coming exam.
（5）One cannot be too careful.
I cannot thank you enough.
（6）I cannot help admiring the picture whenever I look at it.
could have done
He could have passed the exam , but he was too careless.
2.may / might
(1) You may go home now，Susan.
May I have a word with you，please？
(2) May you succeed！祝你成功！
(3) Since we’ve got nothing better to do，we might as well go for a walk.
(4）---where is LiPing？
----He may be cooking in the kitchen.
(5) may have done
He may/ might have already done his homework ,but i'm not sure.
(6) The bike over there might be his.
Don't play football on the road again. you might have been knocked by the car.
3.must
(1) “Must I wash the dishes at once？”“No，you needn’t.”
Animals must eat to live.为了活下去，动物必须吃东西。
(2)mustn’t
You mustn’t play with the knife；you may hurt yourself.
(3) Everyone must die.每个人都必定会死。
(4) If you must know，I’m going to h elp him look for an apartment.
（5) There must be something wrong with the machine.
The novel must have been written by a woman.
4.shall (1) Shall she go to the concert with us this evening? Shall we go out for a walk?
May I have a look？
Shall I have a look？
(2) Don’t worry. You shall get the answer this very afternoon. 不要焦急，今天下午你就会得到答复。
You shall arrive before sunset.
If you don't behave yourself , you shall be punished.
The fine shall be given in cash.
5.should
(1) We should attend the meeting.
(2) The concert should be great fun.
(3) I’m glad that your story should have won the first prize.
I'm surprised that you should speak in such a way.
I should have been kinder to him if I had known the truth.
(4) She demanded that they (should) leave at once.
(5)(用于以lest，for fear that，in case引导的状语从句中)
She gave me a list just in case I should forget what to buy.
6. will /would
(1) The door won't open.
If you will help us, we can finish it earlier.
(2)We would stay up all night talking about our future.
(3) Would you mind if I opened the window？
(4) I would have told you all about the boy's story, but you didn't ask me.
1.—How’s your tour around the North Lake? Is it beautiful?
—It ________ be，but it is now heavily polluted.
A.will
B.would
C.should
D.must
—“No p erson ________ smoke or carry a lighted cigarette，cigar or pipe in this area.”
A.will
B.may
C.shall
D.must
3.—She looks very happy. She ________ have passed the exam.
—I guess so.It’s not difficult after all.
A.should
B.could
C.must
D.might
4.—Where is my dictionary? I remember I put it here yesterday. —You ________ it in the wrong place.
A.must put
B.should have put
C.might put
D.might have put
5.The teacher ________ have thought Johnson was worth it or she wouldn’t have wasted time on him，I suppose.
A.should
B.can
C.would
D.must
6.My MP4 player isn’t in my bag.Where ________ I have put it?
A.can
B.must
C.should
D.would
7.—My cat’s really fat. —You ________ have given her so much food.
A.wouldn’t
B.couldn’t
C.shouldn’t
D.mustn’t
8.The biggest problem for most plants，which ________ just get up and run away when threatened，is that animals like to eat them. A.shan’t B.can’t C.needn’t D.mustn’t
9.There’s no light on—they ________ be at home.
A.can’t
B.mustn’t
C.needn’t
D.shouldn’t
10.If it were not for the fact that she ________ sing，I would invite her to the party.
A.couldn’t
B.shouldn’t
C.can’t
D.might not
11.Don’t interrupt me，John.________ you force me to tell you the truth at the moment?
A.Might
B.Must
C.Should
D.Would
12.The public transportation is very convenient in that big city，so there ________ be any difficulty in traveling around.
A.mustn’t
B.wouldn’t
C.shouldn’t
D.needn’t
13.—Has the manager gone on business?
—No.He ________ have but something prevented him at the last minute.
A.could
B.may
C.can
D.mustn’t
14.Our holidays were ruined by the weather；________ have stayed at home!
A.it may be as well
B.it was just as well we
C.we might just as well
D.we might do as well as we
15.—How exciting! I drove my new car at a speed of 120 km/h on Sunday morning.
—Were you crazy? You ________ yourself!
A.must have killed
B.should have killed
C.might have killed
D.need have killed
