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ago , before的用法和区别-初中英语重点短语用法及其区别

ago ,  before的用法和区别

ago 立足于现在,表示从现在起,若干时间之前;ago 通常与一般过去时连用不能与完成时连用;

I met him three years ago .
(距今)三年前,我遇到他。

I met her once several years ago.
几年前我曾见过她一面。

They checked out ten minutes ago.
他们十分钟前就结账走了。

He and his wife busted up three months ago.
他和他妻子三个月前就关系破裂了。

before 立足过去,表示从过去某一时刻起,若干时间以前。before通常与过去完成时连用。
 
I had met him three years before .
(距当时)三年前我见到他一次。

Write her before you go.
你去之前先给他写封信。

I have seen him before.
我以前曾经见到过他。

You should hibernate before I contact with you.
在我与你联系之前,你得潜伏不动。
 

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