英语语法学习神态动词can和may标明可以性的差异

#神态动词#

1、在必定句中，常用may标明可以。

You had better ask the

policeman. He may know the place.

2、在否定句中，若口气必定，标明“不可以能”时用can't；若口气不必定，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.