看高考试题,学情态动词


来源:高中英语教学交流
发布时间:2010-03-08 13:53:00
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    四、情态动词用法归类与高考试题分析:

    (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:

    (NMET2007 江苏)-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

    (2) should (not) / 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: (NMET2007全国I)-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

    (NMET2005上海)There _________ 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:

    ①(NMET2008浙江)You ______ be hungry already - you had lunch only two hours ago!

    A. wouldn't B. can't C. mustn't D. needn't

    ②(NMET2008天津)She ______ have left school, for her bike is still here.

    A. can't B. wouldn't C. shouldn't D. needn't

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