ago与before的用法区别
区别1 两者均表示“以前,但ago以现在为基准,即指“现在以前,因此常与一般过去时连用;而before以过去某一时间为基准,指“在那时以前,因此常与过去完成时连用(且多用于宾语从句中)。如:
He left two years ago. 他是两年前离开的。
She said he had left two year before. 她说他是两年前离开的。
区别2 before也可泛指“以前,不与具体时间连用。此时可用于现在完成时或一般过去时。如:
I have read the book before. 我以前读过这本书。
He didn’t know that before. 他以前不知道此事。
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