摘要： 关于表示推测的情态动词后面所接动词形式.有下列四种情况: 1)情态动词+动词原形.表示对现在或将来的情况的推测.此时动词通常为系动词.例如: I don't know where she is, she may be in Wuhan. 我不知道她在哪儿.可能在武汉. 2)情态动词+动词现在进行时.表示对现在或将来正在进行的情况进行推测.例如: At this moment, our teacher must be correcting our exam papers. 这时.想必我们老师正在批改试卷. 3)情态动词+动词完成时.表示对过去情况的推测.例如: The road is wet. It must have rained last night. 地是湿的.昨天晚上一定下雨了. 4)情态动词+动词的现在完成进行时.表示对过去正在发生事情的推测.例如: Your mother must have been looking for you. 你妈妈一定一直在找你. [同类预测] 对情态动词表示推测的用法的考查应该是情态动词中最主要德 用法.这一点可以从历年的高考试题中观察到. 应该注重加强对这方面知识的训练和理解. (1)You might just as well tell the manufacturer that male customers not like the design of the furniture. A. must B. shall C. may D. need 答案:C. 解析: may not意为“可能不 .句意是:你不妨告诉厂商男顾客可能不喜欢这种家具的花样. (2)-Isn’t that Ann’s husband over there? -No, it be him-I’m sure he doesn’t wear glasses. A. can’t B. must not C. won’t D. may not 答案:A. 解析:由No和后文I’m sure-可知.是有把握的否定推测.所以用can’t . (3)-There were already five people in the car but they managed to take me as well. -It a comfortable journey. A. can’t be B. shouldn’t be C. mustn’t have been D. couldn’t have been 答案选D.既然小汽车上“已有五人 .且是“设法 才把你带去的.如此拥挤.旅途当然“不可能 舒服. (4)Michael be a policeman, for he’s much too short. A. needn’t B. can’t C. should D. may 答案选B.由he’s too short推知.Michael“不可能 是 policeman. 例2:As a result of the serious flood, two-thirds of the buildings in the area . A. need repairing B. needs to repair C. needs repairing D. need to repair [答案]B . [题源探究] 这是一道综合性的考题.考查特殊词need 的用法和主谓一致的用法. [广角思维] need 在该句中是实意动词.need后可以接动名词的主动表示被动的结构.也可以接不定式的被动结构. [易误警示] 对need的词性把握不准以及need做需要讲后面接什么形式记忆不清.还有相关的主谓一致的用法都是这道题出错的地方. [悟彻高考] need既可用作情态动词也可用作行为动词.主要用法如下: ①作情态动词时表示“需要,必须 .后面当然跟动词原形.仅用于否定句或疑问句中.否定式是needn’t.在肯定句中一般用must, have to, ought to或should代替.如: You needn’t buy the book. ---- Need I finish the work today? ---- Yes, you must. ② 作行为动词时.有时态.人称和数的变化.后面跟to do.否定形式要用don’t/doesn’t/didn’t need.如: He needs to finish it this evening. ③ need用作行为动词时.后面还可以跟动名词或名词.此时含义跟need后面用不定式的含义不一样.“need +动名词 含有被动意义.类似这样的用法还有有want, require.如: [同类预测] need 的用法决定了其在高考中的地位和重要性.做该类试题时务必熟悉need的词性.然后在根据所学的知识对对试题作出真确地判断. (1)It is a good example of a site that many people think to change. A. need B. to need C. needs D. needing 答案:C 解析:此题考查need的用法.还要理清句子结构.that前是个主句.that引导的是个定语从句.其先行词是a site.定语从句中谓语动词应该用单数needs.many people think是插入语.空格处是谓语部分.插入语经常被出题人放在题目中.使句子复杂化.增加句子的难度.做题时可以把插入语去掉.便于理解句子结构. (2) His homework , but it . A. needs correcting; needn’t rewriting B. need be corrected; doesn’t need to be rewriting C. needs correcting; needn’t be rewritten D. needs to be corrected; needn’t to be rewritten 答案:C 解析:本题还是考查need作为行为动词和情态动词的用法.“需要修改 用行为动词need可以说成needs correcting = needs to be corrected.用情态动词need可以说成need be corrected.参考以上表达方式来进行第二空的选择.可见只有C项的两部分都正确. 例3: -Turn off the TV, Jack.. your homework now? -Mum, just ten more minutes, please. A. Should you be doing B. Shouldn't you be doing C. Couldn't you be doing D. Will you be doing 答案:B [题源探究] 考查情态动词的一种独特的表示方法. [广角思维] 根据语境可以知道第一句话的意思是“难道现在你不应该正在做作业吗? 据此可知应该用情态动词should.并且用情态动词的否定疑问句形式. [易误警示] 对是使用情态动词的哪一种形式模糊不清.使用一般疑问句形式呢.还是用否定疑问句形式呢?其实问题的原因主要在于语境把握不住做成的. [悟彻高考] 情态动词有一些特殊的表示形式总结如下:

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