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.
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