摘要：(一)表示推测的情态动词 对现在或将来情况推测.用情态动词+do / be / be doing-,对过去的推测.用情态动词+have done / been-,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can’t / couldn’t.译为“根本不可能 .“想必不会 .表示推测的语气非常肯定.may not, might not或could not译为“可能不 .“也许不 .表示推测的语气不很肯定. (1) must表示推测.意为“一定-- .只能用于肯定句中. must have done意为:一定做过某事或某事肯定发生了. 例如: -She looks very happy. She have passed the exam. -I guess so. It’s not difficult after all. A. should B. could C. must D. might [解析]句意为:她看上去很高兴.一定是通过了考试. [答案]C / ought (not) to在中表示根据常规或常识推测.表示“某事应该或不应该发生 .语气比must或can’t / couldn’t稍弱. 例如: -How’s your tour around the North Lake? Is it beautiful? -It be, but it is now heavily polluted. A. will B. would C. should D. must [解析]should此处表示推测.意为“应该 . [答案]C ②There be any difficulty about passing the road test since you have practiced a lot in the driving school. A. mustn’t B. shan’t C. shouldn’t D. needn’t [解析]句意:既然你在驾校进行了大量训练.那么通过道路测试按理不应该有困难. [答案]C (3) can, could表达推测时.一般用于疑问句和否定句中,can用于肯定句中表示一种理论上的可能性.并不牵涉是否真的会发生.在这种用法中can只能与动词原形连用,could用于肯定句中.语气比may/ might更弱.例如: ①You be hungry already - you had lunch only two hours ago! A. wouldn’t B. can’t C. mustn’t D. needn’t ②She have left school, for her bike is still here. A. can’t B. wouldn’t C. shouldn’t D. needn’t ③It is usually warm in my hometown in March, but it be rather cold sometime. A. must B. can C. should D. would ④Peter be really difficult at times even though he’s a nice person in general. A. shall B. should C. can D. must [解析]①② 两个考题中can用于中表示否定的推测.意为:不可能.一定不会, ③④两个考题中can表示理论上的可能性.翻译为:有时候会--. [答案]① B ② A ③ B ④ C / might (not)表达一种不太把握的推测.意为“或许.可能 ,might的语气比may较婉转.例如: ① Liza well not want to go on the trip --- she hates traveling. A. will B. can C. must D. may [解析]may well为固定搭配.意为:很可能.极有可能. [答案]D ② Although this sound like a simple task, great care is needed. A. must B. may C. shall D. should [解析]这听起来或许是一项简单的任务.但却需要极大的细心. [答案]B ③ -I can’t find my purse anywhere. -You have lost it while shopping. A. may B. can C. should D. would [解析]结合语境可知.回答者是在提醒对方:或许购物时把钱包丢了. [答案]A
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