( 可能是 Kate 。 ) ( 绝对不是 Marry 。 ) ( 可能不是 Tommy 。 ) Mum: Who is it? Jim: ( 一定是 Tom 。 ) It must be Tom. It may be Kate. It can ’ t be Marry It couldn ’ t be Tommy.

It must have rained last night, _________? It must be nice to take a walk here, __________? must 表示推测时，其反意疑问句应根据动词的 实际时态而变化。如： isn’t it didn’t it We must have met somewhere before. You must have seen her yesterday, didn’t you? Must have done 意为 “ 一定做过 ” ，表示对过去发生的事情进 行肯定推测。如： 1. 我们以前一定在哪里见过面。 2. 你昨天一定看到她了，对不？

1. 当你对某事非常有把握时，在肯定句 中用 must, 在否定句中用 can’t. It must be Xiao Ming. He is very tall. It can’t be Xiao Jun. He is very short. You must be Jeanne. It can’t be true. We don’t believe it.

2. 当你认为某事有可能，你可以使 用 can. Anybody can make mistakes. Playing football can be very interesting. Attending a ball can be exciting.

3. 当你认为某事有可能，但却不太有 把握时，你可以使用 could, may, might. could/might 不是过去时 You may not know that the necklace I returned is not the one that I had borrowed. Do you have a friend who might lend you some jewllery?

4. 对过去的事情进行推测时，要用 must/ may/might/could/ can(not)+ have done sth. Xiao Jun must have used a ladder or something else to get the cake. In those days I may have been pretty. can / could have done ，意为 “ 本来能够 ” ， 而实际上都未发生。 如： 你本来可以来早点的。 You could have come earlier.

Rewrite the following sentences using must or can’t 1.I have called him many times, but there is no reply. I am pretty sure he is not at home. He can’t be at home./ He must be out. 2.They have an expensive car. I am sure they earn a lot of money. They must earn a lot of money. 3. They never take a taxi. I am sure they are not rich. They can’t be rich./They must be poor.

4. He has a lot of work to do. I am sure he is terribly busy. He must be terribly busy. 5. Look! So many students are listening to Mr Smith’s lecture. I am sure it is very interesting. It must be very interesting.

1.I am not sure whether he will come or not. He must come tonight. 2.He mustn ’ t be an American because he can ’ t speak English at all. 3.I tried to call him at the office, but there is no reply. He can be at home. may can ’ t must

Is John coming by train? --- He should, but he ____ not. He likes driving his car. (NMET 2002) a. must b. can c. need d. may 5. A left luggage office is a place where bags ____ be left for a short time, especially at a railway station a. should b. can c. must d. will

6. My English-Chinese dictionary has disappeared. Who ____ have taken it? a. should b. must c. could d. would 7. My sister met him at the Grand Theater yesterday afternoon, so he ______ lecture. a. Couldn ’ t have attended b. needn ’ t have attended c. mustn ’ t have attended d. shouldn ’ t have attended

Could I borrow your dictionary? ---- Yes, of course you ____. (NMET1992) a. might b. will c. can d. should

1. Johnny, you _____ play with the knife, you ____ hurt yourself. A. won’t; can’t B. mustn’t; may C. shouldn’t; must D. can’t; shouldn’t 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 3.-I heard they went skiing in the mountains last winter. - -It _____ true because there was little snow there. A. may not be B. won’t be C. couldn’t be D. mustn’t be

4. My English-Chinese dictionary has disappeared. Who _____ have taken it? A.should B.must C.could D.would 5. 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

6.----Can I use your dictionary? ----Yes, of course, you________. A. could B. might C. can D. will 7.---Are you coming to Jeff’s party? ---I’m not sure, I______ go to the concert instesd. A. must B. would C. should D. might

8.The fire spread through the hotel very quickly but everyone _____ get out. A. had to B. would C. was able to D. could