概要：例13：You might just as well tell the manufacturer that male customers ______ not like the design of the furniture.(2004上海春)A. must B. shall C. may D. need例14：--Isn’t that Ann’s husband over there?--No, it _______ be him ---I’m sure he doesn’t wear glasses. (2004全国Ⅰ)A. can’t B. must not C. won’t D. may not分析：在例13中，might just as well表示“最好……，还是……为好”，说明喜欢的可能性不大，故用may not。例14，根据后面的I’m sure可以看出，推测的语气较强，故用can’t译为“根本不可能”、“想必不会”，表示惊异、怀疑的感情色彩，常用于否定语气较强时。答案分别为C、 A。对现在或客观事实的疑问推测
高考必考英语内容：情态动词考点透视,标签：高中英语语法大全,http://www.85jc.com例13：You might just as well tell the manufacturer that male customers ______ not like the design of the furniture.(2004上海春)
A. must B. shall C. may D. need
例14：--Isn’t that Ann’s husband over there?
--No, it _______ be him ---I’m sure he doesn’t wear glasses. (2004全国Ⅰ)
A. can’t B. must not C. won’t D. may not
分析：在例13中，might just as well表示“最好……，还是……为好”，说明喜欢的可能性不大，故用may not。例14，根据后面的I’m sure可以看出，推测的语气较强，故用can’t译为“根本不可能”、“想必不会”，表示惊异、怀疑的感情色彩，常用于否定语气较强时。答案分别为C、 A。
对现在或客观事实的疑问推测，往往用can或could，而不用may/might。
例15：Mr. Bush is on time for everything. How ______ it be that he was late for the opening ceremony？(2001上海春)
A. can B. should C. may D. must
分析：对现在或客观事实的疑问推测，往往用can或could，表示惊异、怀疑、困惑、失望等感情色彩。答案为A。
2、对过去事实的推测
对过去已发生事情的肯定推测常用 “must/may/might +have + v-ed”，“must+ have + v-ed”意思为“想必、准是、一定是”，语气非常肯定且只能用于肯定句，“may/might+ have + v-ed” 意思为“也许、或许”表示推测的把握不大，只能用于肯定或否定句，不用于疑问句；对过去的否定推测常用 “can/could /may’might not + have + v-ed”，意思为“不可能/可能没做过……”；对过去的疑问推测只用“can/could + have + v-ed”，意思为“可能已经……”。
例16：He _______ have completed his work; otherwise, he wouldn’t be enjoying himself by seaside. (2005北京)
A. should B. must C. wouldn’t D. can’t
分析：根据后一分句判断，前一分句应该表示肯定完成了工作，故用“must+ have + v-ed”意思为“想必、准是、一定是”，语气非常肯定且只能用于肯定句。答案为B。
例17：My sister met him at the Grand Theatre yesterday afternoon, so he _____ your lecture.(2000上海)
A. couldn’t have attended B. needn’t have attended
C. mustn’t have attended D. shouldn’t have attended
分析：must表推测时，不用于否定，needn’t have +v-ed 表示“本来没有必要”，shouldn’t have +v-ed表示“本来不应该”，“can/could not + have + v-ed” 意思为“不可能做过……”。故答案为A。
例18：--Do you know where David is? I couldn’t find him anywhere.
-- Well. He ______ have gone far----his coat’s still here.(2005湖北)
A. shouldn’t B. mustn’t C. can’t D. wouldn’t
分析：can’t have gone far 在此表示现在对过去所发生事情的否定推测，意思为“现在不可能走远了”；答案为C。
三、考查情态动词的虚拟用法
例19：—I’ll tell Mary about her new job tomorrow.
--You________ her last week. (2004福建)
A. ought to tell B. would have told C. must tell D. should have told
分析：对过去发生事情的责备或遗憾应用“情态动词+have + v-ed”，据此可排除答案A、C，而would+have +v-ed常用于过去的虚拟语气中，should(ought to)+ have + v-ed”表示本应该做某事而实际上没有做，含有责备的含义。其否定式表示某种行为不该发生但却发生了。故答案为D。
例20：He paid for a seat, when he ______ have entered free. (2005山东)
A. could B. would C. must D. need
分析：“could+ have + v-ed” 用于肯定句中，表示本来能够做成某事的但结果没能做成，含有遗憾的意味，侧重有能力而没能做成。该句意思为：“他花钱买了座位，而他本来可以免费进去的”。答案为A。
例21：You should not have swum in that river. You ____ have been eaten by fish.
A. must B. may C. will D. might
分析：前一分句的should not have swum表示责备，后一分句则表明有被鱼吃掉的可能性。“might+ have + v-ed” 用于肯定句中，表示本来有可能做成某事但结果没能做成，含有遗憾的意味，侧重有某种可能性但没能做成。
例22：—Catherine, I have cleaned the room for you.
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