标题：英语语法中since的用法

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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+ agoI 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.

发布时间：2025-06-05 14:53:42
来源：学历学位网
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