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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)。
例句:
I have been here since 1989.
2) since +一段时间+ ago
例句:
I have been here since five months ago.
3) since +从句
例句:
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
例句:
It is two years since I became a postgraduate student.
点击关注“零食英语”,获取最实用的英语学习知识。