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知识点三 be able to与can be able to与can都有“能”之意,在表示现在或过去“能力所及”时,两者可以通用。

can 只用于现在时和过去时,而be able to则有其他时态形式。

3. (同义句转换) I could run very fast when I was only six.

I   , run very fast when I was only six.

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