好多人都会被情态动词搞混，can和Could，may和might，should和must，什么时候用哪个，我们今天来捋一捋。

我们用might表示可能会发生的事。比如说：

Where are you going for your holidays?

--I'm not sure. I might go to New York.

我可能会去纽约。

It might rain.

可能会下雨。

may和might有什么区别呢？其实两者都可以同样使用，表示不确定，可能会发生的事。比如：

I might go to the cinema this evening.

=I may go to the cinema this evening.

我可能今晚会去电影院。

Sue might not come to the party tonight.

=Sue may not come to the party tonight.

Sue今晚可能不会来参加派对了。

我们用can来表示“知道怎么做...”或者“对某人来说，...是可操作的”。

I can play guitar, but I can't play piano.

我会弹吉它，但是我不会弹钢琴。

Can you swim?

--Yes, but I'm not a very good swimmer.

如果是在过去时态里，我们就用could/ couldn't。

When I was young, I could run very fast.

当我年轻的时候，我可以跑得很快。

Before Anna came to England, she couldn't understand much English, but she can understand everything now.

Anna去英国前不懂太多英语，但是现在她能懂所有事。