while I was sleeping ,the bell rang 中的(I was) 可省吗while 引导从句是当前后主语一致时则从句中的be和主语可省,如果前后主语不一致怎么省略

I was cooking while my sister was sleeping While David ____,I_____.A.writes;was sleeping B.was sleeping;writeC.was sleeping;was writing ____ UFO landed while I ____ last night.A.The; sleep B.An ;was sleeping C./; slept D.A;was sleeping. i was sleeping late ___when _someone knocked on the door 为什么填when 而部填while 求详解 A:A UFO landed while i was sleeping last night. B:Were you scared? A:Not really. A:A UFO landed while i was sleeping last night. B:Were you scared? A:Not really. I was sleeping.对划线部分提问 划线：sleeping 用括号内所给的连词填空.I was sleeping in my bedroom.I was woken up by a loud noise.{while}__________________________ While he was going shopping,I slept还是was sleeping,为什么?那如果是while he was taking a shower ,the UFO landed.这里的while可以换成when吗 while I was sleeping ,the bell rang 中的(I was) 可省吗while 引导从句是当前后主语一致时则从句中的be和主语可省,如果前后主语不一致怎么省略 问一下有关while的问题~While I slept,a thief broke in.是不是差不多等同于While I was sleeping,a thief broke in.Meimei watched TV while she ate her supper.是不是差不多等同于Meimei was watching TV while she was eating her supper I was sleeping late__my friend suddenly knocked at the door填when 还是while ,说明原因,说下怎么分这两个 a boy rushed in while i ___in my room. a.will sleep b.asleep c.was sleeping d.slept请说明理由 A boy rushed in while I ___ in my room.A.will sleep B.asleep C.was sleeping D.slept ,说明理由. While they ______ (fight) with each other ,I was sleeping.这里我不晓得到底填啥?填were fighting又觉的不对劲. i heard a l() voice when i was sleeping 朗读下列句子,体会when 和while的不同.1、 the earthquake happened while i was doing 、 2、while my mother was sleeping,my father was watching tv.3、i was sleping when it started to rian.4、he like singing when he is running.观察： he was sleeping late____someone knocked on the door 1.when 2.while 3.as 4.after