步步高2015届高三英语北师大版通用总复习配套课件专题七情态动词虚拟语气.pdf

◆情态动词的考查要点 1. can，be able to 和 could (1)can 和 be able to 都表示能力，意思上没多大区别。但 can 只有现在和过去时，而 be able to 则有 的形式。但当 成功地完成某一具体动作时，通常不用 could 而用 was/were able to 来表示。这时 was/were able to 相当于 managed to， 表示经过一番努力，终于能够完成某事。 Her mother can speak French. The wounded man was still able to get to the village and was saved by the villagers in . (2)表示猜测 “可能”，一般用于疑问句和否定句。 —Can the news be true? —It can ’t be true. Someone is knocking at the door.Who could it be? (3)can可以表示理论上的可能性，指常有的行为或情 形，意为 “有时会……”。 Anybody can make mistakes. (4)表示请求、允许(表请求时，口语中常用could代替 can使语气更委婉，回答时用can) 。 Can I go now? —Could I come to see you tomorrow? —Yes ，you can.(否定答语可用No ，I ’m afraid not.) (5)表示惊异、怀疑、不相信的态度(主要用于否定句、 疑问句或感叹句中) 。 How can that be true ？I can ’t believe my eyes and ears. How could you be so careless？！ (6)can的特殊用法。 can but只有；can ’t but不得不；can ’t...too再怎样也 不为过，越……越好 I can but wait. I can ’t but wait. You can ’t be too patient to the customers. 题组训练1 用can，could，be able to的适当形式填空 1. Though the building was on fire，they were able to go out safely. 2. It can’t be the postman at the door. It ’s only six o’ clock. 3. —How ’s your new babysitter? —We could not ask for a better one. All our kids love her so much. 4. The still haven ’t found the lost child，but they ’re ng all they can . 5. You can’t be too careful when driving. 2 ．may和might的用法 (1)表示允许、请求，might 比may的语言更委婉一些。 —May I watch TV now? —Yes ，you may.(Yes，please.) —No ，you mus .(No，you ’d better not.) (2) 表示可能性时，might 比may的可能性小，may表示 的可能性比can小(主要用于陈述句、肯定或否定句，疑问句 用can代替) 。 The story may not be true. (3)表示祝愿(不用 might)