I knocked at the door as if i knocked at my own.的时态AS IF 从句叫什么从句来着?主句过去时,AS IF也用过去时?是必须的吗?如果主句将来时,那从句呢

I () my brother when someone knocked at the doorI () (telephone)my brother when someone knocked at the door I went into the classroom and sat down at the second desk right near the doo翻译 并分析 是knocked at the door还是knocked on the door I heard someone ____(knocking/knocked)at the door just now.那用knocked也满足hear加从句呀？ I knocked the teapot over .. When I was in the bathroom sally knocked at the door.错在哪里? knocked at I was studying English when he knocked at the door.改错 整理下列句子 knocked/when/doing/were/what/last night/you/I/at the door 连成句子I,having,when,was,someone,breakfast,at,knocked,door,the Someone knocked at the door () I ()()lunch.(当我吃午饭时) I knocked at the door (l ) of times ,but he didn't hear it. someone knocked( )the door while i( )my houseworka.at,were doingb.at,was doingc.on,was doingd.on,were doing Who knocked at the door?I thought it was Jack.回Who knocked at the door?I thought it was Jack.回答当中为什么有两个谓语,一个句子的基本结构是一个主词加一动词. I ＿＿ when she knocked at the door.A.cook B.cooks C.was cooking D.am cooking I ( ) go out when someone knocked at the door.A.was to B.was going to C.was about to What where you doing when someone Knocked at the door?I ____ ____ ____ ____ ____(接电话) ________you _________ (argue) with your father when I knocked at the door?为什么要用过去进行时?