5.情态动词和虚拟语气易错点1.ppt

* 第五节 情态动词和虚拟语气 易错点20. 对“情态动词+have done 的误用 Mark _____ have hurried. After driving at top speed, he arrived half an hour early.(2010天津） A. needn’t B. wouldn’t C. mustn’t D. couldn’t 情态动词+have done 用法总结： (1) could have done ① “本能够”，可用于肯定句、疑问句和否定句；用于肯定句表惋惜也可以表示对过去动作的推测，用于疑问句表怀疑，用于否定句表不确定。肯定句 ②“过去可能……” can have done 通常只用于疑问句和否定句；用于疑问句时表怀疑，用于否定句时表不确定。Can they have left so soon?难道他们这么快就走了?（表怀疑） He can’t have been to that town.他不可能去过那座城市。（表不确定） （2）should/ought to have done “本应该” （3）needn’t have done “本来没必要” 区别 didn’t need to do sth. “ (过去）没必要做（实际也没做） (4) must have done 过去一定做了某事 （5）may / might have done (过去）或许已经……” 可以通用 might have done 还可以表责备或遗憾，“本可能……” （6）would like to have done “本来想做某事但没做“ （7）would rather have done “宁愿已经做了某事”实际没做 易错点21.情态动词的特殊用法易错点 Don’t play with the dog, Jack, for it ______ be dangerous at times. A. shall B. should C. can D. must can可以表示能力，表示客观的可能性，表示 请求和允许，表示惊异、怀疑。 主要用于肯定句、否定句、和疑问句中。 用于肯定句中表推测时指理论上的可能 性，并不涉及真的发生。 2. —— I think I will give Bob a ring. —— You _____. You haven’t been in touch with him for ages. A. will B. may C. have to D. should 原则或道义上“应该” 易错点22 对一些虚拟语气结构的混淆 ______ fired, your health care and other benefits will not be immediately cut off. A. Would you be B. Should you be C. Could you be D. May you be 2.—— Don’t you think it necessary that he _______ to Miami but to New York? —— I agree, but the problem is ______ he has refused to . A. will not be sent; that B. not be sent; that C. should not be sent;which D. should not send; what should do 结构的虚拟语气： 一坚持 insist 二命令 order ,command