When he will come is not known.为什么用被动语态?

When will he come is not known哪里出错 When he will come back I will call you when he ______back.A.comesB.will comeC.is going to beD.come When will he come to see you? I will wake you up when he _____back. A.come B.will come C. is going to came D.comes when he will come is not konwn yet,but when he comes,he willbe warmly welcomed.为什么come的时态这样用 When he will come is not known.为什么用被动语态? he is come 用he will come back行不行? He will come here when he _____(be) free. When___ again?when he ___,I'll let you knowA.he comes ,come B.will he come,will comeC.he comes,will come D.will he come,comes Do you know when Mr .Brown When he ,please let me know.A.will come; will come B.is coming;comes C.comes;comes D.will come;is coming(第二个问号是标点符号) 为啥用When does he come ,而不是 when will he come When do you know?后面填 he will come 还是will he come When is dad coming home,mom?-When the work-----,he may come home.A.will doneB.doesC.will doD.is done I don't know when he ____,but when he ____,I will let you know.A will come ;comesB comes ;will comeCcomes;comesD will come; will come ---Do you know when Dr White ___for dinner this evening ---But I think he ____when he is free .A、will come ,comes B、will come ,will come请注明正确答案，一定要细 I don't know __ .A.where does he come from B.what is his name C.how old he is D.when will he leave选什么? tell me when he will come back这句话对么