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.

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"

we know myself about each othe they know each other还是others,为什么 They have know each other for 10 years.同意句 The have know each other ____2001. They have know each other for 10 years.同意句 they know waht each other are doingthey each know waht other is doing；they know what each is doingthey know waht they each are doing、这四句哪句是对的.解释说明错在那里 But as they get to know each other more,they find out each other's unique qualities. They became good friends soon after they got to know each other. 问智力测试题1.Two little brothers live near to each othe(彼此）.One is on one side,the other is on the other side.They can hear what you say,but they can not see each other.What are they?_____________2.If the red house is on the right and th Beauly and sadness stick to each othe Because lBeauly and sadness stick to each othe Because lost of people pursue beauty sad. 英语题目 We should help me each other !each other 还可以换成什么?We should help each othe Jack and Susan______(know)each other since they were children,so nobody is surpised tohear they were married.A.had know B.have know He said they( )each other for quite a long time.(know)写出动词的适当形式 How long should a couple know each other before they get married? 单句改错：DO you know when they began to fall in love to each other? it was in this room which they got to know each other这个句子有错吗 they know what each other is doing.为什么错误错在那里. we know each better 猜猜看Do you know who they are?Two little brother,live near each other.One lives on the other side.They hear what you say,But they don’t see each other.Do you know who they are?