When he was crossing the street,a bike koncked him down什么意思

I saw him while he was crossing the street 与 He was crossing the street when i saw him 有什么区别 he was knocked down(when crossing the street).请问括号中为什么可以这样用? When he was crossing the street,a bike koncked him down什么意思 The child was crossing the street when he suddenly-----[fall] to the ground. the old man was knocked down by a taxi when he was crossing the street请问这句用了哪些语法? Bill 's hat was blown off when he was crossing the bridge .变成have+object+p.p. He was seen to cross the street when a car bumped into him.中的to cross是什么用法?改成crossing对么 The first time I remember noticing the crossing guard was when he waved to me as I drove my son to s The wind have got Bill's hat blown off when he was crossing the bridge 为什么要加个got啊 还有h When he was a When was he at be careful when you are crossing the street.可以改写成be careful when crossing the street.when my mother saw that i was unhappy,mother called me to her bedroom.可以改写成seeing that i was unhappy ,mother called me to he bedroom.为什么第 he,lose his pen,he,go sighting in the city,when连词成句还有几题我做好了,When the sun shone,we were coming out.She was working in a factory when the city was liberated.I was seeing him while he was crossing the street. he,lose his pen,he,go sighting in the city,when还有几题我做好了,When the sun shone,we were coming out.She was working in a factory when the city was liberated.I was seeing him while he was crossing the street. He is leaving ____ Chongqing ____ some money.A./,to make B.for ,for make B.for ,to makeD,/,to makeHe ____ the street when a bike hit him.A.was just crossing B,is just crossing C,just crossed D.has just crossedI was writing when the teacher entered th 解释两个句子.从语法方面.定语从句!1.We missed seeing the film when it was on at the local cinema.2.He missed being koncked by a truck when crossing the road.关系词和先行词。说不清楚， 大学英语三级试题 30.The poor old man was _____ yesterday when he was crossing the street.A、run into B、run out C、run over D、run through选哪个为什么? When was he born,为什么不是When was he bear?