while 和 when 的区别和用法,最好举个句子说明

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/03 06:22:54
while 和 when 的区别和用法,最好举个句子说明

while 和 when 的区别和用法,最好举个句子说明
while 和 when 的区别和用法,最好举个句子说明

while 和 when 的区别和用法,最好举个句子说明
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.
  例如:
  1、I was just reading a book when she came into my room.
  她走进我房间时,我正在看书.
  (二)、while只能表示某一段时间,不能表示某一点时间.在while引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在.
  例如:
  1、While Jim was mending his bike,Lin Tao came to see him.
  正当吉姆修自行车时,林涛来看他.

when和while的区别
①when是at or during the time that, 既指时间点,也可指一段时间;
while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。
②when 说明从句的动作和主句的动作可以是同时,也可以...

全部展开

when和while的区别
①when是at or during the time that, 既指时间点,也可指一段时间;
while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。
②when 说明从句的动作和主句的动作可以是同时,也可以是先后发生;while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。
③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.
④when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。
具体你可以参考这一段。
when,while,as引导时间状语从句的区别
when,while,as显然都可以引导时间状语从句,但用法区别非常大。
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和as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。
④ The students took notes as they listened.(listen为延续性动词)学生们边听课边做笔记。
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和as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,as都可使用。
①When /While /As 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 /As 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。
3.当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用 as。这时,as常表示“随着……”;“一边……,一边……”之意。
① As the time went on,the weather got worse.(as表示“随着……”之意)
② The atmosphere gets thinner and thinner as the height increases.随着高度的增加,大气越来越稀薄。
③As years go by,China is getting stronger and richer.随着时间一年一年过去,中国变得越来越富强了。
④The little girls sang as they went.小姑娘们一边走,一边唱。
⑤The sad mother sat on the roadside,shouting as she was crying.伤心的妈妈坐在路边,边哭边叫。
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

收起

while与when的区别
when 与while引导的时间状语从句与这一时态连用,所以区别when与 while的用法成了难点。
一,when与while都有“当。。。。。的时候”的意思,when即可表示某一时间点也可表示某一段时间。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。例如:1,I was j...

全部展开

while与when的区别
when 与while引导的时间状语从句与这一时态连用,所以区别when与 while的用法成了难点。
一,when与while都有“当。。。。。的时候”的意思,when即可表示某一时间点也可表示某一段时间。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。例如:1,I was just reading a book when she came into my room .他走进我房间时,我在看书。2,Were you writing when the teacher came in ?老师进来时,你在写信吗?3,When she was a child he was always trying out new ideas.他小时候就经常试验一些新的设想。
二,while只能表示某一段时间,不能表示某一点时间。在while引导的时间状语从句中,起谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在。例如:1.While Jim was mending his bike ,Lin Tao came to see him .2.You can't do your homework while you're waching TV.你不能一边看电视一边做作业。
三.另外,when和while的区别还在于:while引导的时间状语从句多用进行时态,二我很引导的时间状语从句多用一般时态。例如:1、while they were talking, the bell rang.正在他们谈话的时候,上课铃响了。2、I was doing my homework when my mother came back home yesterday evening. 昨天晚上妈妈吗回家的时候,我正在做家庭作业。when和while 的用法区别 两者的区别如下:1、when是at ro during the time that, 既指时间点,也可指一段时间:while是during the time that, 只指一段时间,因此when 引导的时间状语从句中的动词可以试终止性动词,也可以试延续性动词,而while从句中的动词必须是延续性动词。2、when说明从句的动作和主句的动作可以试同时,也可以试先后发生;while则强调主句的动作在从句动作发生的过程中或主从句两个动作同时发生。3、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 .4、when和while 还可做并列连词。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 motorbike.孩子们正要跑过去半开那袋米。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。

when , while 这三个词都有“当……时候”之意,但用法有所不同,使用时要特别注意。
1、when意为“在……时刻或时期”,它可兼指“时间点”与时间段“,所应道的从句的动词既可以是终止性动词,也可是持续性动词。如:
when i got home, he was having supper. 我到家时,他正在吃饭。
when iwas young. i liked dancing. 我年轻时喜欢跳舞。
2、while只指”时间段“,不指”时间点“,从句的动词只限于持续性动词。如:
while i slept, a thief broke in . 在我睡觉时,盗贼闯了进来。
辨析
1、when从句与主句动作先后发生时,不能与while 呼唤。如:
when he has finished his work, he takes a short rest. 每当他昨晚工作后,总要稍稍休息一下。(when=after)
when i got to the cinema, the film had already begun. 当我到电影院时,电影已经开始了。(when=before)
2、when 从句动词为终止性动词时,不能有while 替换。如:
when he came yesterday, we were playing basketball. 昨天他来时,我们正在打篮球。
3、当从句的位于是表动作的延续性动词时,when,while 才有可能互相代替。如:
while/ when we were still laughing, the teacher came in. 正当我们仍在大声嬉笑时,老师进来了。
4、当从句的谓语动词是终止性动词,而且主句的谓语动词也是终止性动词时,when可和as通用,而且as比用when在时间上更为紧凑,有“正当这时”的含义。如:
he came juse as (or when ) i reached the door. 我刚到门那儿,他就来了。
5、从句的谓语动词如表示状态时,通常用while.如:
we must strike while the iron is hot. 我们一个趁热打铁。
6、while 和when 都可以用做并列连词。
mike is tall while his brother is short. 迈克的个子很高,然而他弟弟很矮。
mary was no her way home when two big boys stopped her. 玛丽正在走回家的路上,这时两个大个子男孩拦住她。

收起

其实很容易理解 while 后加过去进行时 eg While Tom was watching TV,his mother came in .
但是当while两边都是同时发生的时候前后都用过去进行时 eg While Mary was singing ,Lucy was dancing .
when 后加一般过去时 When the teacher came in, the students were stopping talking