By the time he comes,we half of it.by the time he comes,we half of it.这里为什么是will have finished而不可以have finished?

来源：学生作业帮助网编辑：作业帮时间：2024/04/30 07:37:39

By the time he comes,we __half of it.by the time he comes,we __half of it.这里为什么是will have finished而不可以have finished?
By the time he comes,we __half of it.
by the time he comes,we __half of it.
这里为什么是will have finished
而不可以have finished?

By the time he comes,we __half of it.by the time he comes,we __half of it.这里为什么是will have finished而不可以have finished?
by the time这里肯定是用完成时,而这个动作还没有发生,所以要用将来完成时,因此不能用 have finished

意思是他来的时候，我们将完成它的一半。
表示的是将来完成时，所以用will have finished

是将来完成时态，因为by the time..还没发生，意思是“到他将要来到的时候，我们将会完成一半了。”

因为他现在还没来,时态表将来,而且以BY开头的,结合语境又必须是完成时,所以用将来完成时比较好.

因为by the time he comes 是假设的将来时,所以用将来完成时.

因为他来这个动作并没有完成，所以要用将来完成时。

关键是COMES，说明他没来（至少没完成），所以。。。

将来完成时，前面是时间状语从句，有一般现在时表示将来，后面的主句表示将来完成，是将来完成时。

By the time he comes,we will have finished half of it. 是将来完成时态
他来的时候，我们都将完成它的一半。
假使他那个时候来的话,我们都完成一半了.(但是事情还未发生)

by + time, 用完成时，根据后面时间的不同用不同的完成时（将来，现在，过去），by the time he comes, 时间状语从句用一般时表示将来时，所以是表示将来的时间他到来，用将来完成时。

因为他来这个动作并没有完成，所以要用将来完成时

翻译By the time he comes,I'll have left.( By the time he came,I had left.) by the time you came back,we (complete)the work by the time he comes back,we (complete)the workby the time you came back，we (complete)the workby the time he comes back,(complete)the work By the time he comes,we __half of it.by the time he comes,we __half of it.这里为什么是will have finished而不可以have finished? Would you please give me a hand?Otherwise I cannot finish the work ____.A.before he comes B.by the time he had come C.when he comes D.until he has come为什么其他的不对 ( )I could not finish the work____________.A.by the time he had came B.until he has comeC.when he comes D.before he came( )There_________the bus!Hurry up!A.is coming B.comes C.has come D.come This is the f____ time he comes to this town. I knew I could not finish the homework()A.by the time he had come B.before he came C.until he has come D.when he comes选什么为什么?句意? I -----my work by the time the teacher ----- back.shall have finished,comes 为什么填这个动词填空：She ( ) by the time he got back.(go ) By the time that we got there,he was out. he often comes to school by bike when the time comes that he does get there,中的语法分析 tiis is the __(five) time he comes here.用单词的适当形式填空 Bob comes out of the station and at once he doesn't know where to go.意思This is the fist time he comes to this town. I will have finished the homework by the time mymom comes back这句话翻译成中文怎么翻译 by the time he returns,the project probably ____ahead of time by the time ,by then He usually comes here____?选哪个?A.by ships B.by ashipC.by seaD.by the sea选C 那如果说做船来怎么表示呢?