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英语四六级考试中，单独考察语法的题型不多，但是语法知识点却贯穿整张试卷，小伙伴们，趁着寒假，赶紧来打好基础吧！

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+ 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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