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动词的时态: 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 1989. 1989 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。
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