画线句子为什么要把while改为when

英语画线句子为什么要把while改为when 画线句子为什么要把while改为when 英语 这里画线句子为什么要把the改为a while they can not do their homework,they copy from their schoolmates.为什么要把 while改为 when? 把画线句子改为肯定句.反问句 英语 这里 划线句子为什么要把which改为that 英语过去式when,while和过去进行时、过去式怎么搭配出句子,为什么 把they remember what they were doing when they heard about the event.改为用while引导 英语 画线句子第二句为什么要用to be 改错：When he worked as a journalist, he visited many countries. 为什么when改成while?While he went to Hong Kong, he sang with Jackie Chan. 为什么把While改成when? 怎么对画线部分提问?怎么把一个句子改为同义句?单数句子?请专业人士回答,这是全部英语句子 1.The girl called the police while the alien was buying a souvenir.(改为一般疑问句)________________________________________________________________2.The boy was doing his work when the UFO took off.(对画线部分提问）____________________ 1.The girl called the police while the alien was buying a souvenir.(改为一般疑问句)________________________________________________________________2.The boy was doing his work when the UFO took off.(对画线部分提问）____________________ while the alien was buying a souvenir,the girl called the police.这个句子如果把while换成when可不可以?换了之后, he was drawing something on the desk (while) i was reading a story yesterday.这个句子能不能用when代替while?解释为什么? “当我回家时,我看见了一是狗”请大家用when与while翻译要区分when与while的不同是分别用when与while翻译上面这个句子 画线的句子能否解释一下为什么? 画线的句子OK为什么大写