since连接的从句的时态
回答
爱扬教育
2022-04-02
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2.Since作为副词 表示从过去以来、以后或到现在的情形或状态,常与现在完成时态连用。
3、since引导原因状语从句作为连词,since可引导原因状语从句,表示因为;既然。
扩展资料
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).例如:
I have been here since 1999. 1999起,我一直在这儿.
2)since +一段时间+ ago.例如:
I have been here since five months ago. 我在这儿,已经有五个月了.
3)since +从句.例如:
Great changes have taken place since you left. 你走后,变化可大了.
Great changes have taken place since we were here. 我们走后,变化可大了.
4)It is +一段时间+ since从句.例如:
It is two years since I became a postgraduate student. 我考上研究生有两年了.