why didn't you go to the movie yesterday?because i(had )seen it before.为什么不能用have

问题描述:

why didn't you go to the movie yesterday?because i(had )seen it before.为什么不能用have

yesterday的电影,是过去时,我在之前已经看过了,看的时态,是过去完成时,所以要用had done!

before 是表示在看电影之前,要用过去完成时或过去时。

如果用have,have seen是现在完成时,现在完成时表示动作从过去一直持续到现在,一般与since连用较多.比如:It is five years since he left.自从他走了(到现在为止)已经5年了.用had是过去完成时,一般在这样的题中都...