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1、精品文档Can/could 的用法1.can/could 都属于情态动词，本身有各种意义，具体在句子中不同。2.情态动词不能单独作谓语，只能和动词一起构成谓语。3. 情态动词没有人称和数量的变化。4. 表示说话人的语气和情感。Can/could 的几种句式：肯定句 否定句 缩略式can can not cantcould could not couldnt疑问句：can you.?could you.?Can/could 用法共同点：1. 都表示具备的能力，指现在、过去无论什么时候想做就能做到的能力。 Could 表示过去的能力，can 表示现在或将来的能力。2. 在否定句和疑问句中，都表示猜
2、测语气。Can 表示猜测的可能性要多些， 而 could 表示猜测的可能性要小、轻些。3. 都可以表示建议和请求，can 表示肯定，could 的请求语气更委婉。Can 与 could 用法不同点：1. can 的语气肯定，could 语气比较委婉。2. can 通常用在表示现在的事 情，3. could 用在表示过去的事情。4. 当表示允许别人做某事时，用 can 而不用 could.一、判断下列句子的用法：1. A hen cant swim.1. How can that be true?2. Could you pass the paper to me?1. I couldnt pla
3、y the piano until I was fifteen years old.2. What you said couldnt be true.1. Can I take this seat?2. Could I use your phone?3. Yes,of course you can.精品文档精品文档二、选择题1. At that time we thought the story_ not be true.A)could B)must C)can2. You_ the work better in the future.A)could did B)can do C)could
4、do3.The room is dirty; it _cleaned.A) cant be B) couldnt be C) mustnt be4.Mary _my letter, because she is worring about it now.A) should receive B) cant receive C) couldnt receive5.An Englishman who _not speak Chinese in China.A) must B) could C) can6.Mr Wang _ write last year, he was ill for three
5、years.A. mustnt B. couldnt C. cant7. Who is the man over there? Is it Mr Li? -No, it _ be him. Mr Li is much taller. A. mustnt B. could not C. cant7. Could I seat here?-Yes, of course you _.A.A. can B.could C.must三、按要求完成句子1. He can ride a bike. （改一般疑问句和否定句，并作肯定和否定回答）一般疑问句_ 否定句_ 肯定回答_ 否定回答_ 2.你会弹吉他吗？_ you _ _ guitar?3.两年前我不会骑自行车。I _ _a bike two years _.四、下列各句均有一处错误，请指出并改正1.He can speaks English very well.A B C D2.Can you play a piano?A B C D3.He doesnt buy something his brother.精品文档精品文档A B C D4. I couldntspeak Japanese when I am four. A B C D5. What can you sister does?A B C D精品文档