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.

4) It is +一段时间+ since从句

It is two years since I became a postgraduate student.