only when he comes back can we know about what has happened to him能不能帮我分析一下这是一个什么样的句型,为什么那个can要在we的前面

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 only when he comes will it be possible to settle this problem.翻译及语法, 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 ( )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 do you know when the meeting begin?BLANK he comes backA if B when C until 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 I knew I couldn't finish my homework ( ).A.by he had come B.until he came C.when he comes D.before he comes .--Do you know when he ___ back --Sorry ,I don”t .When he ___back ,I”ll tell you .A(comes.will come) B (will come ,comes) 46.I don't know when he ____a__,but when he ______,I'll let you know.A.will come/comes B.comes/will come C.comes/comes D.will come/will come为什么选A? Please let me know about it _____.A when he will come B whether he will come C when he comes D whether he comeswhen he comes 为什么不能用whether 为什么when 后不能用将来时 ------ he comes back,I'll tell youA where B when C how D what I don’t know when he _________ tomorrow.If he _________,I’ll let you know.A.comes,comes B.will come,comes C.comes,will come D.came,will come she asked you when( )again?Tell her that I'll let her know when he( )A.he came ,comes B.would he come ,will come C.he came, will come D.he would come , comes he may fall behind ___ students when he comes back.A other B the other 能分析下吗? he will cross that bridge when he comes to He never 什么(ring) the doorbell when he comes back 一般现在时表示将来时46.I don't know when he ______,but when he ______,I'll let you know.A.will come/comes B.comes/will come C.comes/comes D.will come/will come为什么这里不能两个comes?不是comes一般现在时可以表示将来时 Only after he comes to consciousness you can make the final decision.A.Only B.to C.you can D.m