they were walking on the street when all of a sudden they saw a 100 yuan bill.为什么不能用while

They met her （when they were walking on the street）.（针对括号部分提问） they were walking on the street when all of a sudden they saw a 100 yuan bill.为什么不能用while they are walking at the beach 和 they are walking on tht beach有什么区别 They kept on walking ＿＿they found a lake.填while还They kept on walking ＿＿they found a lake.填while还是when? They were on a long journey翻译 they were closing in on a deal. the soldiers were walking through a forest after they swam____the river为什么填across They were walking in the forest when suddenly a sanke 首字母是a填什么? two friends were walking through a desert.During the j_____ they had a quarrel. ________(尽管)the students were tired ,they didn't stop walking. They were walking in the street( ) he saw thema.whileb.whenc.as soon asd.before After walking for two hours without a rest,they were all out of______.(strong) 否定句 They were tired after walking We took picture in the park last mouth. They were walking along the road when the UFO landed.(改为一般疑问句） The were walking at seven o`clock yesterday.对were walking提问时,这道题怎么写——they—at the moment?一个-是一空 The were walking at seven o`clock yesterday..对were walking提问时,这道题怎么写——they—at the moment? 一句英文的语法理解Anna waited until they were walking out of the park before she spoke.为什么用 were walking Do you know where my home is?do you know what this is?what were you doing when I walking on the road?I was talking to youWas she here a moment ago?She was herewaht time were they cooking?when I came home,they were cooking in the kitchen.what are you