状语从句I saw a UFO while i was walking down the street yesterday.这里主句是过去式,那从句怎么用was walking 不是说主句是一般过去式,从句是过去式的某个形态

状语从句I saw a UFO while i was walking down the street yesterday.这里主句是过去式,那从句怎么用was walking 不是说主句是一般过去式,从句是过去式的某个形态 ___ the way,I saw a UFO yesterday. A ufo flew over my head while I was waking toward the bus stop yesterdayA UFO flew over my head while I was waking toward the bus stop yesterday 为什么是 A UFO flew ,不是 A UFO was flying呢?while引导的时间状语从句不是主从句都 i saw a saw saw a saw. when引导的时间状语从句为什么从句主句都用一般现在时,或一般过去时.列;I get annoyed when my classmates borrow my eraser and don‘t return it.I saw a big black dog when i came in. I was walking down the street when a UFO landed down.谢是并列句还是从句啊?为什么书上说when是并列连词?谢给为高手了,帮帮忙吧不是时间状语从句么？ i heard someone saw a UFO last night哪里错了?heard someone saw a 中改一个。 I saw a UFO _____on center street at 10 o'clock last night.(land)在这里应该用see sb do 还是see sb doing 还是see(that)加从句? I had a very unusual __________yesterday.I saw a UFO land in front of me.A.decisionB.testC.friendD.experience i saw a saw saw a I never saw a saw saw a I saw a saw swa a saw. i saw a man saw a saw with a saw What were you doing when the UFO arrived?和I was walking down the street when a UFO landed down.为什么前者是时间状语从句,而后者是并列句,我不太明白希望各位高手给我指点迷津,谢谢了 趣味翻译 I saw a saw saw a saw I saw a saw saw a saw的中文意思 I have never saw a saw saw a saw是什么意思? 翻译,先到先得.I saw a saw saw a saw.