since用法归纳,since用法固定搭配

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since用法归纳,since用法固定搭配(1)

since的四种用法:

1) since 过去一个时间点 

(如具体的年、月、日期、钟点、1980, last month, half past six)。

例句:

I have been here since 1989.

2) since 一段时间 ago

例句:

I have been here since five months ago.

3) since 从句

例句:

Great changes have taken place since you left.

Considerable time has elapsed since we have been here.

4) It is 一段时间 since从句

例句:

It is two years since I became a postgraduate student.


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