can 一般用于一般现在时,一般过去时(用过去式could)
be able to 除了上两种时态以外还可以用于别的时态,如完成时态,将来时态
此外还可以有不定式的形式,如:
to be able to...
be able to do sth 它与 can 有什么区别
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