初中英語：since的四種用法

1) since 過去一個時間點(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 一段時間 since從句

It is two years since I became a postgraduate student.

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