初中英語(yǔ)：since的四種用法

1) since 過(guò)去一個(gè)時(shí)間點(diǎn) (如具體的年、月、日期、鐘點(diǎn)、1980, last month, half past six)。

I have been here since 1989.

2) since 一段時(shí)間 ago

I have been here since five months ago.

3) since 從句

Great changes have taken place since you left.

Considerable time has elapsed since we have been here.

4) It is 一段時(shí)間 since從句

It is two years since I became a postgraduate student.

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