| can/could 情态动词 |
Can/Could I borrow you pen?表示请求别人允许或答复时的情况 |
| can/could 表推测 |
I can have lunch with your tomorrow if you like.可以表示可能性 |
| can/could 天生的或学到的能力 |
- I could drive a car by the time I was sixteen.过去时
- I tried again and found I could/was able to swim.过去时
- Can Jane swim yet?现在时
- No, but she’ll be able to swim in a few months’ time. 表示将来的“能力”时，则用 will be able to
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| 正在发生的事时 |
Look! I can stand on my head. |
| 表示成功地完成某一具体动作时 |
- It’s pity he couldn’t visit Mary. 如果表示某一动作没有取得成功，则可用 couldn’t
- Oh, didn’t you know? He was able to visit her after all. 通常不用 could，而用 be able to
- He was able to leave Europe before the war began. 他在战争开始之前得以离开欧洲。
- He was able to go to London yesterday and he enjoyed himself very much.
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| 过去某一具体活动时 |
- Could he borrow a car? 可用 could
- Yes, he was able to borrow a car after all./No, he couldn’t. 但回答是肯定的时候则不能
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