English语法_副词 - ago / before / since

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1> ago

I saw his sister three days ago.
三天前我见过他妹妹。

• 【 ago 】从现在算起若干时间以前。用于过去时；
• ago 以前搭配时间；

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2> before

I told him that I had met his sister three days before.
我告诉他我三天前见过他的妹妹。

• 【before】从过去算起的某个时间以前。用于过去完成时；

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3> befor 可不配时间

I knew that I had senn her befor,
我知道我以前见过她，

• knew 代表过去；

but I couldn‘t rember where（I had seen her）.
但我记不起在哪儿见过她。

• I had seen her 可省略；

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4> since

The property has been in my own name since our marriage.
从我们结婚后，财产就一直在我自己的名下。

• 【 since 】从过去某个时间到现在为止。

• since : 在这句中是介词；

• proper 【adj.】 真正的， 像样的，适当的；
  property 【n.】所有物，财产；
  记忆方法，铁驴有适当的财产；