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1、一.情态动词表推测（一）意思：表示肯定推测的情态动词按可能性大小依次为 must, should / ought to, may, might, could；否定推测，常用cant / couldnt，译为“不可能”,表示推测的语气非常肯定，may not, might not译为“可能不”、“也许不”，表示推测的语气不很肯定。 （二）句式：顺口溜:肯不肯, 妈妈肯，妹不问。即: can不用于肯定式; must仅用于肯定句； may(might)不用于疑问式，用于否定和疑问句。1can 通常只用于否定句或疑问句，一般不用于肯定句，而could 可用于肯定句、否定句和疑问句。两者没有时间上的差别
2、，只是could 比 can 更委婉，更不确定。cant 不可能It cant couldnt be true. 那不可能是真的。What can could they do? 他们会在干什么呢?We could go there this summer. 今年夏天我们可能要去那儿。 (1) Ive taken someone elses green sweater by mistake. It _d_ Harrys. He always wears green. A. has to be B. will be C. mustnt be D. could be（2）You _b_ be hun
3、gry already ,you had lunch only two hours ago! A. wouldnt B. cant C. mustnt D. neednt (3)Do you know where David is? I couldnt find him anywhere. Well. He _c_ have gone farhis coats still here. A. shouldnt B. mustnt C. cant D. wouldnt (4) Michael _b_ be a policeman,for hes much too short. A.needt B.
4、cant C.should D.may注：can 有时也用于肯定句中表示推测，主要用于表示理论上的可能性(即从理论上看是可能的，但实际未必会发生) Anybody can make mistake. 任何人都可能犯错误。 (1)Two eyes _a_see more than one. A) can B) may C) will D) might 2 must只用于肯定句。must的否定式是cant couldnt (1).Susans parents have bought a large house with a swimming pool. It _b_be very expensiv
5、e. A.must B.can C.mustnt D.cant (2).This book_a_Lucys.Look! Her name is on the book cover. A.must be B.may be C.cant be D.mustnt be 3may, might两者均可用于肯定句和否定句，一般不用于疑问句. 即使用于疑问句时，may，might通常不用于句首，只用于特殊疑问句中。may not, might not译为“可能不”、“也许不”，表示推测的语气不很肯定。两者没有时间上的差别，只是might表示的可能性更小些，语气更委婉, 。He may might know
6、 the answer. 他可能知道答案。He may might not believe you. 他可能不会相信你。And who may might she be? 那么她会是哪一位呢？ (1). Are you coming to Jeffs party? Im not sure. I _d_go to the concert instead. A. must B. would C. should D.might (2).Helen _b_ go on the trip with us but she isnt quite sure yet. A. shall B. must C. m
7、ay D. can (3). Go and ask Mr Smith. He _b_ know her telephone number. A. can B. may C. need D. dare (4). -He_c_ be in the classroom, I think. -No, he _ be in the classroom. I saw him go home a minute ago. A. can; may not B. must; may not C. may; cant D. may; mustnt (5). Mr.Bush is on time for everyt
8、hingHow it _a_be that he was late for the opening ceremony？ Acan Bshould Cmay Dmust (6) I cant find my purse anywhere. You _a_ have lost it while shopping. A. may B. can C. should D. would (7)You might tell the manufacturer that male customers _c_ not like the design of the furniture. A. must B. sha
9、ll C. may D. need 4. should/ought to（应该，很有可能）指按常理推测 This pen ought to /should be yours. 这支笔应该是你的。 (1)When can I come for the photos？I need them tomorrow afternoon They b be ready by 12：00 Acan Bshould Cmight Dneed (2)Its nearly seven oclockJack _c_come back. Amust Bneed C. should Dcan 5. will ,would
10、（一定，很有可能会) I think he will be all right now.我想他现在一定好了。 He will have gone back to New Zealand .他一定是回新西兰去了。 I think that would be his mother.(would be 表示肯定是) (三) 情态动词表推测的三种时态 1.对现在或将来情况作推测，后接动词原形。It cant couldnt be true. 那不可能是真的。He may might tell his wife. 他也许会告诉他妻子。I must be the happiest woman on ear
11、th! 我一定是世界上最幸福的女人了。2对正在进行的情况作推测，后接 be doing 结构；What can could they be doing? 他们会在干什么呢?He may might be writing a letter. 他可能在写信。No, he must be lying. 不，他一定在撒谎。 You should be doing your exercises instead of watching TV. (1) Do you know Ms. Wang likes walking after supper ? Sure. She _d_ around the cam
12、pus now. A. must be walkingB. must walk C. may walkD. may be walking (2) Be quick! They _c_ for us at the church gate right now. A. must wait B. must have waited C. must be waiting D. ought to wait3.对过去情况的推测，用“情态动词 + have +过去分词”。 (一） 对过去情况的推测，用“情态动词 + have +过去分词”。 must+have done 只用于肯定句中，意为“一定”，其否定的意
13、义用cant+have done表示。He must have mistaken my meaning. 他一定误会了我的意思。can/could have done 也许；可能.用于疑问句或否定句中。 He could have gone home. 他可能已经回家了。may (might)+have done意为“也许；可能”。多用在陈述句，用might 比用 may 语气更加委婉。She may might have read it in the papers. 她可能在报上已读到过此事。 (顺口溜:肯不肯, 妈妈肯，妹不问。即: can不用于肯定式; must仅用于肯定句； may(m
14、ight)不用于疑问式，用于否定和疑问句。)should/ought to+have done表示预测，意为“应该会，可能”。 Its twelve oclock now. She should/ought to have already got there.(1) There were already five people in the car but they managed to take me as well. It _d_a comfortable journey. A cant be Bshouldnt be C mustnt have been D. couldnt have been (2) My sister met him at Grand Theatre yesterday afte
