2021-12-16

情态动词

must 必须

need 必要

can 能；可以

should 应该

may 可能；能

could 可能

can／could 提问（表请求允许）

肯定can答／否定 can't答

【例句】

Can I use your ruller, Mike?

——Of course, you can.

【例句】

Could I go to the movies with my friends after school?

——Yes, you can. But don't stay out too late.

【例句】

Could you play the piano at the age of five?

——No, I couldn't , I started at six.

Lang Lang could play the piano when he was 3 years old.