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）。

I have been here since 1989.

2） since +一段时间+ ago

I have been here since five months ago.

3） since +从句

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

It is two years since I became a postgraduate student.