can 和 may 的分别是:
can 是说能力上的.
may 是请求对方准许与否用的.
例:
Do you think I can do it?
Yes,you can.
Do you think I can eat all these?
Yes,I am sure you can.
May I come in?
Yes,you may.
May I have a look?
Yes,you may.
希望可以帮到你.