when和while的用法区别(最新整理)

1、when 和 while 的用法区别when 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。when 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。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

2、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.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

3、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。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。 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

4、好的工作，为何还想再找新的？sorry，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。strike 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。 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。when he had f

5、inished 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。when 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。when 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。whenwhileas she was making

6、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。 as the time went on，the weather got worse（as 表示“随着”之意） the atmosphere gets thinner and thinner as the height increases随着高度的增加，大气越来越稀薄。as years go by，china is get

7、ting stronger and richer随着时间一年一年过去， 中国变得越来越富强了。the little girls sang as they went 句子如下：that day, i was doing my homeworkmy younger brother was watching tv. suddenly the doorbell rang.a.when b.while c.before d.afterwhen 和 while 都可以表示“两个动作同时发生”的含义， 此时它们的不同之处在于 while 有表示“对比”的含义，如题目中一人在做作业，一人在看电视，强调两人做不

8、同的事情，有对比的含义when 和 while 都可以用在多种行为或情况同时发生。具体情况有下面四种：1. 我们经常用 when 和 while 引导时间状语从句引出一个大的背景，而在这个背景之下发生发生了主句所描述的行为。i.e.somebody broke into the house when/while they were playing cards. 他 们在打牌的时候有人闯进了房子。2. 当表示两个长时行为与情况同时发生时，用 while 而不用 when.i.e.while you were reading the paper, i was working.你在读报时，我在工作。

9、3. when 引导的从句表示在主句中描述的大背景下发生了另一行为。这时不能用 while.i.e.i was asleep in my chair when dora rang to say she wasnt coming home.我睡觉的时候，多利给我打电话说她不会回家。4. 当表示年龄或是生命中的一段时间时，用 when 而不用 while.i.e.when i was a child we lived in london. 我小时候住在伦敦。“”“”at the end, xiao bian gives you a passage. minand once said, people

10、 who learn to learn are very happy people. in every wonderful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet