can的用法:
①表示有能力做某事,意为“能、会”。如:
The girl can sing in English.
②表示许可,意为“可以”,如:
You can drive my car to the post office.
③表示推测,意为“也许,可能”。如:
He can’t be your brother, you don’t look the same.
may的用法:
①表示请求,语气比can弱。如:
–May I use your eraser?
– Certainly. But you must give it back to me soon.
②表示推测,意为“也许,可能”。如:
She may be at home. Let’s go to see him.
情态动词的否定式和疑问式:
①否定式:一般在can, may后面加not。如:
You can’t use the bike.
He may not be right.
②疑问式:将can, may提前即可。如:
I’m very tired. May I have a rest?
Can you help me (to) study maths?
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