英语语法学习：情态动词can和may表示可能性的区别

#情态动词#

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1、在肯定句中，常用may表示可能。

You had better ask the policeman. He may know the place.

2、在否定句中，若语气肯定，表示“不可能”时用can"t；若语气不肯定，则用may not。

Mr. Li can’t be in the room. He has gone to Beijing.

--Is John coming by train?

--He may not. He likes driving his car.