I,while,was,down,the,walking,street,alien,an,of,out,got,UFO,the(连词成句）

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,while,was,down,the,walking,street,alien,an,of,out,got,UFO,the(连词成句） 1.the boy was walking down the streetwhen the UFO landed.2.while the boy was walking down the street,the UFO landed.3.the girl was shopping when the alien got out.4.while the girl was shopping,the alien got out.5.i am mad at marcia.6.she said she was While the boy was walking down the street,the UFO landed,对While the boy was walking down the street提问 I was really down for a while, but I'm ok now是什么意思? while the boy was walking down the street,the UFO landed同义句4种 while the boy was walking down the street,the UFO landed ( ) the boy was walking down the street,the UFO lended. while还是when “I saw an old lady knock down by a motorbike while she was walking across the street”哪个词有问题 while Tom saw the UFO,he was walking down the street with his friends有一处有错, The computer system suddenly broke down while he was search for information on the Internet. To be orI was really down for a while,but Im ok now --I was riding along the street [ ]a car cut in and knocked me down.---You can never be [ ]carefulin the street .A,when ;enough B,while ;so C,when ;too D,while ;very 【说明原因, 1 -what was he doing when the UFO landed?-while the boy ____,the UFO landed.a.was in the bathroom b.was cookingc.was walking down the street d.was sleeping2.-hi,Mary!I tried to call yesterday morning but no one answered.-_______a.I'll go shopping b.I 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 While I was watching TV,the phone______(ring) 填什么 while i was ate a meal the telephone is ranging.