since作为介词后边接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。ever since后面可以不加任何东西,也可以加名词或者加从句。
since的用法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.
5、用于句型“一段时间+has passed since+时间状语从句”中,译作“自从…以来, …(时间)已经过去了”。
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