Anybody who wants to can become a prison visitor.
①---What shall we do ?
---We can try asking Lucy for help. ②
Who can that be at the door ? Can it be Polly? ③
may 可用来表达:①将来的可能性;②说话时某事可能是真实的
We may go climbing this summer. ①
You may be right. ②
could / might 可用来表示: ①说话时某事可能是真实的;②将来
某事有可能发生,但不表示特别可能发生。
You could be right, but I dont think you are. ①
It could rain later on this evening. ②
4、can, could, may 和might表示允许
①请求允许:它们都可以表示请求允许做某事,could 和 might并不是表示过去
Can (May, Could) I borrow your umbrella ?
②允许:当我们允许某人做某事时,我们用can和may来表达,而不能使用could和might
You may / can watch TV for as long as you like. (不用could, might; mustnt 有拒绝的意思)
---Could I use your phone?
---Yes, of course you can /may. (No, you cant / may not.)
5、can和could表示提议和请求
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