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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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