1.--Is John coming by train? --He should, but he ____ not. He likes driving his car. (2002高考题） A. must B. can C. need D. may 2.It has been announced that candidates(候选人) ____ remain in their seats until all the papers have been collected. (2002上海高考题） A. can B.will C. may D. shall 3.--I heard they went skiing in the mountains last winter. (2002北京高考题） --It ____ true because there was little snow there. A. may not be B. won’t be C. couldn’t be D. mustn’t be
can could may might shall should must will would ought to
have to dare (daren’t) need (needn’t) used to
I daren’t ask her for a rise. 我不敢请求她加薪. How did you dare to tell her that? I wonder whether he dare stand up in public. I don’t know how she dares to wear that dress. Do you need any help? I wonder whether he need send it immediately. I need hardly tell you that the work is dangerous. The garden doesn’t need watering at the moment. You needn’t finish that work today.
可兼做行为动词的情态动词：need 、 dare 情态动词 (+动词原形) 行为动词
1.无人称和数的变化; 多用于肯定句; need 2.尤其用于： (sb.) need to do *否定句及疑问句中; dare to do *在if/whether之后; . (sth.) need to be *或与hardly, never, no one, nobody连用; done dare 3.常以needn’t 和daren’t (sth.) need doing 的形式出现; 4.dare有其过去时dared.
判断正误: How dare you say such a thing? How dare you to say such a thing?
He daren’t to speak English before such a crowd, did he? He daren’t speak English before such a crowd, dare he?
Nobody need to be afraid of catching the disease.
Nobody need be afraid of catching the disease. These dishes need be cleaned carefully. These dishes need to be cleaned carefully.
These dishes need cleaning carefully.
注意对need问句的回答: --Need I finish the work today?
--Yes, ________________. you must
No, ________________. you needn’t
No, ________________. you don’t have to
--Shall I tell John about it? --No, you __________. needn’t (don’t have to) --Must we do it now? --No, you __________. needn’t (don’t have to)
1. You must be Mr Smith----I was told to expect you here. 2. He must have known what we wanted. 3. We may have read the same report. 4. He can’t have slept through all that noise. 5. There’s someone outside----who can it be? 6. What can they be doing? 7. These pills might help to cure your disease. 8. You could be right, I suppose.
表示推测——情态动词的重要用法. 情态动词 肯定的推测 对将来 对现在 对过去
+ V. must/should 常见must be 可能的推测 + V.
+ V. + have done + be doing
+ V. + have done + be doing 可以用not表示“可能不” + V. + be doing + V. + be doing + have done