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1、Module 6 Unexplained Mysteries of the Natural WorldGrammarmay have/ might have教学目标1教学重点：may have done /might have done 的意义和用法。2教学难点：掌握情态动词+have done 的用法情态动词+have donemust+have done表示对已发生情况的肯定推测，译为“（昨天）一定”It must have rained yesterday,for the ground is wet.can / could not+have done多用于否定和疑问句中，表示对已发生情况
2、的否定推测或怀疑，不相信，译为“（昨天）一定没”。He couldnt have gone to Beijing. I saw him just now.could +have done用于肯定句表示过去本来可以做而实际上没做He could have passed the exam, but he was too careless.may/might(not)+have done表示对过去发生的事情的可能性推测，表示“可能已经(没有)做了”1.They might have talked about monsters among them。2.In Chinese culture, drag
3、ons may have been closely connected to the royal family.Should/ought to+have done should not /ought not to +have done表示应该做某事但实际上未做，译为“本应该”表示本不应该做某事但实际上做了，译为“本不应该”往往含有责备之意You shoudnt have spoken to your father like that.neednt+have done表示做了不必做的事，相当于”didnt need to do”，译为“其实没必要”。如：You neednt have broug
4、ht the umbrella,I brought it .Would rather(not) +have done表示“当时宁愿做（不做）某事”I would rather have taken his advice.Had better not +have done含有轻微责备之意，表示“当时最好”You had better not have scolded him .二情态动词may,might常考的考点1.表推测，用于肯定或否定句中，may not “也许不”might语气弱于may. He may know it or may not.Although this may sound
5、 like a simple task, great care is needed.尽管这听起来可能像一项简单的任务，但是需要非常仔细。【典例】（2009辽宁）The traffic is heavy these days. I_ arrive a bit late, so could you save me a place? A can B must C need D might解析：本题目考查情态动词：might往往表示较小的可能性，符合题意。can能，会；must必须，一定；need需要。句意：最近几天，交通比较拥堵。我有可能会迟到一会儿，因此请你给我留个位子好吗？答案：D2.表请求，用
6、于第一人称的疑问句中，希望对方给予肯定的回答，migh语气更委婉。May/Might I use your pen? Yes , . No , .【归纳】肯定回答 否定回答 【典例】(2010四川)- _I take the book out?-Im afraid not.A. Will B. May C. Must D. Need解析：本题目考查情态动词：表示“请求对方的允许时”，常用may或can。句意：我可以把书带出去吗？恐怕不能。依据句意理解，则选项B符合题意。答案：B【注释】may,might常考句型1may/might （just） as well “不妨，最好”，与had bet
7、ter相近；Since the flight was cancelled， you might as well go by train.既然航班已经取消了，你不妨乘火车吧。相当于you had better go by train。2 may /might well 表示推测“很可能”，相当于be very likely to.Liza may well not want to go on the trip-she hates traveling.莉莎极有可能不想去旅行她讨厌旅行Her appearance has changed a lot and you might well not re
8、cognize her.【归纳】总结may as well, may well, as well , as well as用法 3.“may+动词原形”，表示“祝愿”、“但愿”。may须置于句首。May you a Merry Christms！【基础巩固 全面训练】1. Listen! Theres a lot of noise from next door. They _ a party.A. could have had B must be havingC. should have had D. can be having2. I_ have been more than six yea
9、rs old when the accident happened. (2005天津)A. shouldnt B. couldnt C. mustnt D. neednt3.-Excuse me, is this building the city library?-Sorry, Im not sure. But it_ be.A. can B. must C. might D. will4.-I didnt go to the party yesterday because my car broke down.-You_ mine. I wasnt using it.A. ought to
10、borrow B. would have borrowedC. had better borrow D. could have borrowed5.Research findings show we spend about two hours dreaming every night, no matter what we_ during the day.A. may be doing B. could have done C. must have done D. might have done6. Theres no light onThey _ be at home.A. cant B. m
11、ustnt C. neednt D. shouldnt7. The cake is very sweet. You _a lot of sugar in it.A. should put B. could have putC. might put D. must have put 8. The weather turned out to be fine yesterday. I_ the trouble to carry my umbrella with me.A. should have taken B. could have takenC. neednt have taken D. mustnt have taken9. The flowers are dead. I _ them yesterday.A. should water B. must waterC. should have watered D. must have watered10. There_ many people_ in the office, but now nobody is allowed to.A. used to be; smoking B. used to have; smokingC. used to be; smoke D. used to have; smoke
