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篇1:高考英语词汇讲解:as,when,while的用法区别详解
用法与区别:
1.若主句表示的是一个短暂性的`动作,而从句表示的是一个持续性动作时,三者都可用。如:
He fell asleep when[while,as]he was reading.他看书时睡着了。
I met him when[as,while]I was taking a walk in the park.我在公园散步时遇到了他。
注:as用于引出一个持续性动词表示“在……期间”时,其谓语通常只能是那些含有动作和发展意味的动词,一般不能是那些不用于进行时态的动词,所以下面一句中的while不能换为as:
A:I’m going to the post office.我要去邮局。
B:While you are there,can you get me some stamps?当你在邮局时,能帮我买几张邮票吗?
2.若主、从句表示两个同时进行的持续性动作,且强调主句表示的动作延续到从句所指的整个时间,通常要用while。如:
Don’t talk while you’re eating.吃饭时不要说话。
3.若从句是一个短暂性动作,而主句是一个持续性动作,可以用as或when但不用while。如:
When[As]he came in,I was listening to the radio.他进来时,我在听收音机。
It was raining hard when[as]we arrived.我们到达时正下着大雨。
4.若主、从句表示的是两个同时发生的短暂性动作,一般要用as。如:
I thought of it just when[as]you opened your mouth.就在你要说的时候,我也想到了。
5.若要表示两个正在发展变化的情况,相当于汉语的“随着”,一般用as。如:
Things are getting better and better as time goes on.随着时间的推移,情况越来越好。
As it grew darker,it became colder.天色越晚,天气越冷。
6.表示“每当……的时候”,一般要用when。如:
It’s cold when it snows.下雪时天冷。
He smiles when you praise him.你夸奖他时他总是笑笑。
7.若主、从句所表示的动作不是同时发生,而是有先后顺序时,一般要用when。如:
I will go home when he comes back.他回来时,我就回家去。
I will discuss this with you when we meet next time.我们下次见面时,我要同你讨论这个问题。
8.when可用作并列连词,表示“这时”;while也可以用作并列连词,表示“而”、“却”;但as则没有类似用法。如:
We were about to start when it began to rain.我们正要出发,这时天开始下雨了。
He likes coffee,while she likes tea.他喜欢咖啡,而她却喜欢茶。
9.as和when之后均可直接跟一个名词,构成省略句;但是while一般不这样用。如:
As[When]a boy,he lived in Japan.他小时候在日本。
As[When]still a student,he wrote a novel.当他还是个学生的时候,他就写了一本小说。
10.when和while之后可接现在分词、介词短语、形容词等构成省略句,但as一般不这样用。如:
When[While]reading,he fell asleep.他看书时睡着了。
篇2:when和while的区别用法
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.
②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.
③when 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.
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.
篇3:when和while as的用法区别口诀
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 you’ve 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。
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。
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。
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。
4.在将来时从句中,常用when,且从句须用一般时代替将来时。
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...
篇4:when和while的用法区别口诀
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。
hen,adv. (副词)
when的基本意思是“什么时候”。可用作疑问副词,用来询问某事曾发生或将要发生的时间,引导特殊疑问句; 还可用作关系副词引导限制性定语从句、非限制性定语从句和表语从句,表示“是…时候的事”。
when,conj. (连词)
when可用作从属连词,引导状语从句,表示时间时作“当…时,在…的.时候”解; 表示条件时作“如果,要是”解; 表示对比时作“既然,考虑到”解。当when所引导的从句的主语和主句的主语一致时,常将其主语、系动词或助动词省去,只留实义动词或表语,或者改写为短语。
when所引导的时间状语从句用一般现在时代替将来时,用现在完成时代替将来完成时。
篇5:when和while的区别
when有鉴于之意,如:
Why do you need a new job when you have got such a good one?
when 有虽然、尽管等让步之间,如:
They kept digging when they must know there was no hope to escape.
while 有对比之意,译为“而”。如:
That region has plenty of natural resouces, while this one has none.
while 有表示“部分同意”之意,如:
While she is likable girl, she is difficult to work with.
when和while 都有“在...时候”的意思。
主从句都是长时间的动作时,只用while;
While she read the paper, I cleared up the kitchen.
涉及到年龄和生活的不同阶段,用when;
When I was a child , I lived in London.
while不用于短时间的动作(这个大家应该都知道)
when和while的区别
(1)when即at the time that…,指「在……之时」,例如:
When I finished my letter, I posted it.
我写完信便寄出。
(2)while即at the same time that…,亦指「在……之时」,但其所表示的「同时」有「持续性」,例如:
We must strike while the iron is hot.
我们必须趁热打铁。
(3)while不可用来表示「时间点」(a point of time),例如:
错:While I finished my letter, I posted it.
因为动作具有「瞬间性」。
(4)while可用于对比(contrast),when则不可,例如:
Mary is in blue while Cindy is in black.
玛丽穿蓝色衫,而仙蒂穿黑色衫。
(5)while又可表示「只要」(as long as),例如:
While there is life, there is hope.
留得青山在,不怕没柴烧。
(6)再可表示「尽管」(although),例如:
While I admit that the task is difficult, I don't think that it is impossible.
[when和while的区别]








