while i was walking on the street,l met him.怎么改写句子中对分词的使用!

While I was walking in the street,I met Liu Dehua.转化为I met Liu Dehua while I was walking in the street.while换when, I while was walking I heard a strange noise句子结构有误吗 While I was walking on the street I _(meet) a friend of mine I happened_(meet)one of my old friends while I was walking in the street was,while,walking,I,saw,to,I,a,in,cat,school,a,tree(.)连词成句 i was singing songs 【 】walking home A as B when C at D while a car n____ hit me while i was walking across the street 这个 “n”后 A UFO flew over my head while I was walking to ward the bus stop yesterday. 连词成句 while walking was car the exploded past i it I saw an accideng_____i was walking in the street.------中选 while before after until in the street,a terrible car accident happened,resulting in three deaths. A While walking B Walk C Walking D When I was walking One day while I ____ along the street,I ____ someone calling.A.walked…was hearing B.was walking…has heard C.was walking…had heard D.was walking…heard为什么选D不选C While I was walking in the street,I met Liu Dehua.可不可以转化为I was walking in the street,while I met Liu Dehua.后半句中应用while还是when?转化为I was walking in the street while I met Liu Dehua. While I was walking down the street,I saw a cat in the tree 改为同义句 I found somebody following me when I was walking down the street last night.when可以用while代替吗 I was walking home from school,I met an old friend.A.Because B.Until C.Although D.While I,while,was,down,the,walking,street,alien,an,of,out,got,UFO,the(连词成句） ( )I was walking along the street ____I met a friend of mine.A.while B.when C.as D.then