小升初必备语法：since的四种用法

小升初必备语法：since的四种用法为http://www.pxzj8.com整理发布，类型为小学英语语法，本站还有更多关于小学英语语法大全,小学英语语法总结，英语学习 - 英语语法 - 小学英语语法的文章。 正文：

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.

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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