when he will come back is what we want to know为什么is后面要加what,这句话不是主语从句么,从属连词已经有了不是么

When he will come back When will he come to see you? 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 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 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 tell me when he will come back这句话对么 she asked me,when will he come?变间接引语 When will he come is not known哪里出错 When will he be back when will he come back When he came back 他什么时候回来,都是什么动态 when__again?when he__,i will let you knw.A.he comes;comes B.will he come;will comeC.he comes ;will come D.wll he come;comes ( )tomorrow ,I Will ask him where he has beenA.when he comes B.while he comes C.when he will come D.while he will come When do you think he will come?还是When do you think will he come?是正确的? I don't know when he _(come)back.when he _(come)back,I will call you He doesn't tell me when he （ ）.I’ll phone you when he ( )A、will come,comes B、will come,will come C、comes,will come D、comes,comes He will come l( ) He will come ( )autumn