大学英语六级考试中，有很多单词的用法会因为具体的时态产生不同的用法，很多同学在这种带有语法的单词使用上概念会比较模糊。今天沪江小编就为大家分享一下大学英语六级考试中单词since的四种用法，希望对大家有所帮助。

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.

搞懂语法，对于理解文章的大意会非常有帮助，所以要备考大学六级英语考试的同学一定要把语法常识搞懂哦。更多精彩内容，请关注沪江网。