they (know)each other since they (begin) to work in that factry.请问正确时态是什么呢?1.knew.began.2.have known.began.3.had konwn.began.
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they (know)each other since they (begin) to work in that factry.请问正确时态是什么呢?1.knew.began.2.have known.began.3.had konwn.began.
they (know)each other since they (begin) to work in that factry.
请问正确时态是什么呢?1.knew.began.2.have known.began.3.had konwn.began.
they (know)each other since they (begin) to work in that factry.请问正确时态是什么呢?1.knew.began.2.have known.began.3.had konwn.began.
2
在这里since从句后面谓语动词用一般过去时,主句用现在完成时
这里有一些例句,可以看一下然后理解一下
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.
1
verb tense agreement, 都是过去式
had known = 知道一件事
have known, began
since后面毫无疑问过去时，“从、、开始就认识”持续到现在，主句用现在完成时
had known 过去完成时，表示“过去的过去”例如“they had known each other before last year"