as/when/while的区别 ____ he was a teenager ,he started playing the piano as a hobby 就这道题讲解

When,While,as的区别和用法~

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

as和when、while的区别

时间连词while，as与when是同义词，均可解为“当……时候”，用来引导时间状语从句。它们有时通用，有时不通用。

　　while意为during the time that(“在……期间”)，它只指“时间段”，不指“时间点”，从句的动词只限于持续性动词。例如：

　　One day while they were working in the fields, some farmers saw something strange in the sky. (JB5, )

　　一天，几个农民在地里干活的时候，他们在天空中看到了一些奇怪的东西。

　　Strike while the iron is hot.

　　趁热打铁。

　　as意为at the same time that(“正当……”或“与……同时”)，它兼指“时间点”与“时间段”，从句中的动词既可是终止性动词，也可是持续性动词。例如：

　　“Where?”asked another，as he stopped to look. (JB5, )

　　“在哪儿?”又有一个人边停下来看，边问道。

　　The door bell rang as we had / were having breakfast.

　　正当我们吃饭的时候，门铃响了。

　　when意为at or during the time that(“在……的时刻或时期”)，它也可兼指“时间点”与“时间段”，从句中的动词既可是终止性动词，也可是持续性动词。例如：

　　The film had been on for five minutes when I got to the cinema. (JB5, )

　　当我到达影院时，电影已经开映了5分钟。

　　When he returned from work, his wife was cooking.

　　他下班回家时，他的妻子正在做饭。

　　由此可见：

　　1. 指“时段”方面，3者大体可以通用。例如：

　　While / As / When the British guards searched him, Nathan Hale stood quietly.

　　英军卫兵搜身时，内森·黑尔兀立不动。

　　2. 指“时点”方面，as，when可通用，但与while不通用。例如：

　　As / When(不用While)we reached Beijing, it happened to be raining.

　　(当)我们抵达北京时，天正好下着雨。

　　3. when有时指时间先后，其意义相当于before或after。此时，与while或as不通用。例如：

　　When (= Before) I got to the station, they were already there.

　　当我们到达车站时，他们已经先到了。

　　When (= After) he heard this, he got very angry.

　　听了这话以后，他很生气。

　　总的说来，3者的功能区别大体可作如下描述：

　　while为主句动作的发生划定一个时间的范围;

　　as为主句动作的发生提供一个伴随的动作;

　　when为主句动作的发生规定一个特定的时间。

期待高手讲解

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