摘要：情态动词can, could, may; might基本用法. (1) 许可can/could (a) 请求can/could I-?用could婉转. (b) 同意或拒绝Yes, you can. No, you can’t. (c) 其他情况 When I was young, I could swim across the river. These days children can do what they like. When can I go to the hotel? 以上例子不用May/might代替. May/might表说话人的请求同意或拒绝.这一点和can的相同.其他用法不成立. (a) 请求May/Might I-? 以上回答及其他陈述不用Might(因为could, might表示婉转).主句是过去时的间接引语例外. (b) 同意或拒绝Yes, you may/No, you may not/No, you mustn’t/you’d better not. 以上答语及其他陈述均不用might(因为could, might表示婉转).但主句是过去时的间接引语例外. (2) 可能性 (a) can在肯定句中仅指一般的或理论上的可能. If you have fifty or sixty books at home, this can be your library. It can be very cold here, even in May. (b) can在疑问句.否定句中表示可能性. Can it be true? No, it can’t be true. (3)能力 can/could表示能力.be able to do表示某人有作某事的能力.它可以根据不同的时间关系构成各种时态. Fish can swim, and I can swim too. He will be able to swim.

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