ca和could用于什么句(ca和could用法总结)

导语：易错用法：用can还是could?

1.表能力

现在：

She can speak five languages.

过去：

He could play basketball well when he was a kid.

2.表可能性

现在：

Alcohol can cause disease.

可能性极低

It could be weeks before we get a reply.

过去：

He could have escaped, but he chose to fight.

3.表允许

非正式：

Can I go home now?

礼貌、正式：

Excuse me, could I just say something?

4.表请求

非正式：

If you see Sara, can you tell her I’m in town next weekend.

礼貌、正式：

Could you turn that music down a little,please?

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