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1、考点8 表猜测的句型难 点 诠 释典 型 例 题高 考 闯 关/Click to add Text/不可能比can not 弱/有可能吗？比can 弱 考点考点11：对现在和未来的推测：对现在和未来的推测(语气由强到弱语气由强到弱)否定式 疑问式mustshouldought tocancould必定、必然应该是同should/可 能词 形肯定式可 能 不比may not 弱/maymight或许、也许比may 还弱典型例句 Someone is knocking at the door.It must be Mary.(I can read her step.)It should be Ma
2、ry.(She had made a promise to come.)It can not(could not)be Mary.(She has gone abroad.)Can/Could it be Mary?It may/might be Mary.(but I am not sure.)It may not/might not be Mary.must常用于肯定句，一般不用于否定句和疑问句;can常用 于否定句、疑问句或感叹句中，表示疑惑、惊讶或不相信等意思.could既可用于肯定句又可用于否定句和疑问句中。could,should,might不一定与过去时间有关，而是表示可能性弱。
3、温馨提示 must have done(用于肯定句)1 can have done(疑问、否定)could have done(肯定/否定/疑问）2 may have done(肯定、否定)might have done(肯定、否定)3It must have rained last night.for the road was quite muddy.This article about travelling in USA can not have been written by him because he has never been there at all.Do you still
4、remember the daywhen we went to the Great wall.I can not remember it well,butcould it have been sometime last summer?It is too late,I think he may havegone to bed./He may not havefinished his homework,for the light in his room is still on.考点2:对过去的推测 高 考 链 接It_ have been Tom that parked the car here,
5、as he is theonly one with a car.(2009.上海卷)A.may B.can C.must D.should 答 案 解 析 句意:一定是汤姆把车停在这里的，因为只有他有车。根据后半句as he is the only one with a car可知，此句表达的是非常肯定的推测。must have done表示“过去一定做了某事”。A、B两项表示并非十分肯定的推测;should have done表示“本应该做某事而实际上未做”。答案:C 高 考 闯 关1 You _ be hungry already you had lunch only two hours
6、ago.A.may not B.cant C.mustnt D.neednt There is no light onthey _ at home.A.cant B.mustnt C.neednt D.shouldnt 2 句意：你不可能已经饿了，你吃午饭才两个小时。根据句意可知此句表示对现在的推测。mustnt 不表示“推测”，而表示“禁止”,neednt也不表示“推测”,故排除C、D两项。may not“可能不”，can not“不可能”。答案:B句意：灯没亮，他们不可能在家。此句是对现在的推测。must表“推测”不用于否定句，neednt不表示“推测”故排除B、C 两项。should表“
7、推测”不用于否定句。答案:A 高 考 闯 关I have taken someone elsesgreen sweater by mistake.It_Harrys.He always wears green.A.has to be B.will be C.mustnt be D.could be3The meeting is important and he_ be here in time.he startedearly enough.A.can B.should C.might D.will 4 句意:我错拿了别人的绿毛衣。它可能是Harry的，因为他总是穿绿毛衣。根据句意，此句表示“推
8、测”,A、B不表示“推测”must表“推测”不用于否定句。答案:D根据题干中he started early enough可知，本句是说话人根据一定情况作出的推测，故选should表示“理应”。might表示推测时，表示的可能性很小，不符合语境。答案:B 析 高考 高考 闯 闯 关 关（1 1）A.cant B.wouldnt B.C.shouldnt D.neednt She _ have left school,for her bike is still here.答案解析 答案解析句意：她不可能已经离开了学校，因为她的自行车还在这儿。根据题意，该句是对过去情况的推测，wouldnt ha
9、ve done是虚拟语气,shouldnt have done表示责备“该做某事而未做”，neednt have done 表示“做了不必做的事”。答案:A 高考 高考 闯 闯 关 关（2 2）I can not find my purse anywhere.You _have lost it while shopping.A.may B.can C.should D.would 答案解析 答案解析句意:我的包找不到了。你可能在购物的时候丢了。can have done不用于肯定句，故排除B项；should have done“该做而未做”表责备；排除C项；would have done不表推
10、测。may have done“过去可能发生了某事”，符合题意。答案:A析 析 高考 高考 闯 闯 关 关（3 3）A.should B.could B.C.must D.might She looks very happy.She_ have passed the exam.I guess so.It isnt difficult after all.答案解析 答案解析句意:她看起来很高兴，她准是通过了考试。我猜也是，考试一点都不难。根据句意排除A、B两项。might have done意“过去或许发生了某事”推测的语气是最弱的。答案:C 高考 高考 闯 闯 关 关（4 4）My MP4 p
11、layer is not in my bag.Where _ I have put it?A.can B.must C.should D.would析 答案解析 答案解析句意：我的MP4不在包里，我有可能把它放在哪里了呢？B项 must have done表推测不用于疑问句;选项C should have done表责备，故排除。选项D would have done不用于推测。所以正确选项为A.答案:A 析 答案解析 答案解析句意:那位女生物学家归国前在非洲研究了13年野生动物。哦，天呐！她一定经历了很多困难。根据句意可知是对过去的推测，情态动词+have done表示对过去的推测，故排除选
12、项A、B项。ought to have done等于should have done表示“该做某事但未做”，表责备,不表推测，故排除选项C.must have done“过去准是发生了某事”。答案:DA.may go through B.B.might go through C.C.ought to have gone through D.D.must have gone throughThe woman biologist had stayed in Africa studying wild animals for 13 years before she returned.Oh,dear!She _a lot of difficulties.高考 高考 闯 闯 关 关（5 5）