1) since +过去一个时间点 。
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.
【since的四种用法】相关文章:
★ 不定式作状语
★ 分词的语态
★ 独立主格
★ 副词及其基本用法
最新
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29