要注意must和have to的用法区别?must表示说话人的主观看法,而have to表示客观的需要,意思是"不得不"?例如:
18. -Can you go swimming with us this afternoon?
-Sorry, I can't. I________take care of my little sister at home because my mother is ill.
(2003南京)
A. can B. may C. would D. have to
Answer: 18. D
回答must开头的一般疑问句,如果是否定的回答,要用needn't或don't have to,表示"不必","没有必要"的意思,不用mustn't,因为mustn't表示禁止或不许,意思是"一定不要"的意思。例如:
19. -Must I finish the work before five o'clock?
-No, you________. (2003四川)
A. needn't B. mustn't C. have to
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。
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