when和while有什么区别啊?
1、由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时；如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如：
a. When the teacher came in, we were talking.
当此句改变主从句的位置时,则为：
While we were talking, the teacher came in.
b. They were singing while we were dancing.
2、when和while 还可作并列连词.when表示“在那时”；while表示“而,却”,表对照关系.如：
a. The children were running to move the bag of rice when they heard the sound of a motor bike.
孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音.
b. He is strong while his brother is weak.
他长得很结实,而他弟弟却很瘦弱.
3、when,while引导时间状语从句的区别
一、when可以和延续性动词连用,也可以和短暂性动词连用；而while只能和延续性动词连用.
① Why do you want a new job when youve got such a good one already?（get为短暂性动词）你已经找到如此好的工作,为何还想再找新的?
②Sorry,I was out when you called me．（call为短暂性动词）对不起,你打电话时我刚好外出了.
③Strike while the iron is hot．（is为延续性动词,表示一种持续的状态）趁热打铁.
二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while从句的谓语动作必须是和主句谓语动作同时发生.
1．从句动作在主句动作前发生,只用 when.
①When he had finished his homework,he took a short rest．（finished先发生）当他完成作业后,他休息了一会儿.
②When I got to the airport,the guests had left．（got to后发生）当我赶到飞机场时,客人们已经离开了.
2．从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while都可使用.
①When ／While we were dancing,a stranger came in．（dance为延续性动词）当我们跳舞时,一位陌生人走了进来.
②When ／While she was making a phonecall,I was writing a letter．（make为延续性动词）当她在打电话时,我正在写信.
4．在将来时从句中,常用when,且从句须用一般时代替将来时.
①You shall borrow the book when I have finished reading it．在我读完这本书后,你可以借阅.
②When the manager comes here for a visit next week,Ill talk with him about this．下周,经理来这参观时,我会和他谈谈此事.
三、when用于表示“一……就……”的句型中（指过去的事情）.
sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．．
①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door．我刚一闭上眼,就有人在敲门了.
②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．我刚一走进房门,电话就响了.
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点省茵花： while和when都有当什么时候讲的意思.但是,前者强调同时发生,而后者可以是时间点,也可以是时间段. 估计您问得就是这个. 希望能够帮助到你.谢谢!
江津市18098707739： 白话解释while和when的区别 - ？
点省茵花： when强调动作的瞬间性与不可持续性;while用于持续性动作的“当...时候”. 例如:1.The boy was walking down the street when the UFO landed.While the boy was walking down the street,the UFOlanded.2.I was painting the wall when Sophie came in.While I was painting the wall, Sophie came in.
江津市18098707739： when与while有什么区别? - ？
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江津市18098707739： when和while有什么区别? - ？
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江津市18098707739： 英语中的when和while在(句子)用法上有什么区别? - ？
点省茵花：[答案] 朋友, 据相关资料和本人的理解,when和while最大的区别就是:when一般是接一个平常的事件或者是延续性词组,而while主要接正在发生的动作或者说是非延续性的事件.
江津市18098707739： when与while有什么区别？
点省茵花： ①when意为＂在……时;当……时＂,可表示＂点时间＂或＂段时间＂,从句谓语可以是终止性动词,也可以是延续性动词.例如: When I got home, he was having supper. ③while只可表示＂段时间＂,从句谓语只限于延续性动词.例如: While I was sleeping, my father came in. 注:从句谓语是持续性动词时,when、while和as可以互换?主?从句谓语都是终止性动词时,when与as可互换?从句谓语表示状态时,通常用while.
江津市18098707739： when和while有什么区别?？
点省茵花： (一)、when,while都有“当……时候”的意思.when既可表示某一点时间,也可以表示某一段时间 .在when引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,可与主句中的谓语动词同时发生,也可在其后发生....
江津市18098707739： 英语中when和while的区别 - ？
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江津市18098707739： while跟when的区别????？
点省茵花： 1.while后面跟时间段,when后面可跟时间点或时间段(一般跟时间点). 2.while中主从句动作必同时发生,when中主从句动作可不同时发生. 3.while中谓语动词必用延续性动词,when中可用延续性或瞬间性. 4.while可表示转折,when不行.
江津市18098707739： when 和 while的区别啊?？
点省茵花： when和while意思都是当......的时候,都可以接时间状语(从句),但用法有不同: when后常接非延续性动词,即表示动作是短暂的如: We were reading books when he came in. while后常接延续性动词,因此,一般while前后的动词都是ing形式的,如: We are watching TV while mother was cooking. 注意:while常是表示两种动作同时发生,而when有一前一后的意味.
