20. -________I come back before five o'clock?
-No, you________. But you________be back later than seven o'clock.(2002烟台市)
A. Need; must; mustn't B. May; mustn't; can't
C. Can; can't; can't D. Must; needn't; can't
21. -Must I clean the room right now?
-No, you________. You________clean it after lunch. (2002徐州市)
A. needn't; can B. needn't; may
C. mustn't; canD. mustn't; may
Answers: 19. A 20. D 21. B
b.考查must表示推测的用法。
在这一用法中,must意为一定,肯定,表示可能性很大,通常用于肯定句,在否定句中要用can't,表示不可能。例如:
22. Susan's parents have bought a large house with a swimming pool. It ____be very expensive. (2003上海)
A. must B. can C. mustn't D. can't
23. This book________Lucy's. Look! Her name is on the book cover. (2002河南)
A. must be B. may be C. can't be D. mustn't be
Answers: 22. A 23. A
三、考查may的用法
a.考查may表示请求许可的用法
在这一用法中,may表示许可或征询对方许可,表示可以的意思,常常与第一人称I连用,构成May I...?句式,表示我可以吗?肯定回答用Yes, you may.; Yes, please.等;否定回答用No, you can't.或No, you mustn't.,不用No, you may not.?例如:
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