2012年公共英语二级考试写作语法解析2

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.来自www.telnote.cn

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.

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