After school, I was about to enter my apartment while I saw a little dirty dog lying beside a dustbin.这道改错题应该把while改成when,但是很多学生都改不出来,这就是不明白when和while的区别,那么它们到底该怎么用呢?
while表示当……时候,相当于when 英语解释为during the time that sth is happening eg.Her parents died while she was still at school. 她还在读书时,父母就去世了
while放在句中表示转折,对比,相当于but eg.He likes swimming while I like reading 他喜欢游泳而我喜欢阅读
while放在句首翻译成虽然,尽管,相当于although eg.While I am willing to help, I do not have much time available. 尽管我愿意帮忙,但我没多少时间。
at or during the time that 在……的时候,当……时 eg.I loved history when I was at school. 我上学时喜欢历史
while引导的从句只能用延续性动词,而when引导的从句可以用延续性动词也可以用非延续性动词。
when引导的从句动作和主句动作可以同时发生或在之后发生,while只能同时发生或存在