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?

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?