since是什么时态标志？

since，是现在完成时态的标志，他引导的从句用过去式。组句就用现在完成时

匿名回答于2020-10-25 18:45:34

since是现在完成时态的标志。since的意思是自从，since不管用作介词、连词还是副词，句子（主句）谓语通常都用现在完成时。since和for+时间，都可以和现在完成时连用，并且谓语动词常用延续性动词。

匿名回答于2020-10-25 18:45:58

since是现在完成时态标志。

I've worn glasses since my childhood.　　

The works have been closed since January.　　

He's put on a lot of weight since he gave up smoking.　　
有时用于现在完成进行时。

例如：　

He has been working since noon.　　
有时用于一般现在时。

例如：　

It's a long time since I met you last.　　

It's just a week since we arrived here.

匿名回答于2021-11-13 00:46:23