I had never seen it before为什么要用过去完成时啊

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I had never seen it before为什么要用过去完成时啊
I had never seen it before
为什么要用过去完成时啊

I had never seen it before为什么要用过去完成时啊
因为是before
我以前从来没有看过它
说明现在看到了
就不能延续到现在
所以用过去完成时

强调结果..而且口语中也经常这么说..

只是一个单独的句子吗?应该是根据短文的语境确定的

强调说这句话之前从来没看过,只是强调。

从现在以前说ago,从过去某时间以前说before,所以ago是和past tense(过去时)同用的,before是和Past Perfect(过去完成时)同用的。since做副词用,也意为以前,二者时态都可以。例如;
A centure ago people did not know airplane.
i came back yesterday,but he had came...

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从现在以前说ago,从过去某时间以前说before,所以ago是和past tense(过去时)同用的,before是和Past Perfect(过去完成时)同用的。since做副词用,也意为以前,二者时态都可以。例如;
A centure ago people did not know airplane.
i came back yesterday,but he had came back two days before.
The tree cast their leaves a month since.
He said his father hag died two years since.

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