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。
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