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when和while的区别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 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。 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? 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 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。 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。 When 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。 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 getting 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小姑娘们一边走,一边唱。 The 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。 You shall borrow the book when I have finished reading it在我读完这本书后,你可以借阅。 When 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)。 sbhad hardly(scarcely) done sthwhenHardly Scarcely had sbdone sthwhen I had hardly scarcely closed my eyes when someone knocked at the doorHardly 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。 I had hardly scarcely entered my room when the telephone rangHardly Scarcely had I entered my room when the telephone rang我刚一走进房门,电话就响了。1.I thought her nice and honest I met her. (1998年上海)A.for the first time B.the first time C. first time D. by the first time答案:B.the first time 用来引导状语从句分析:for the first time是介词短语,只能作状语,不能接从句;the first time相当于一个连词,引导状语从句,同时定冠词the不能省略,故选B。透视the first time/day,the moment/minute/second, immediately, every time, next time等表示时间的名词短语可用作连词,引导时间状语从句。time构成的搭配还有:at a time 一次;at one time 曾经;all the time 一直、总是;at times 时常;from time to time 间或;in time 及时;on time 准时;time and time again 一次又一次;at the same time 与此同时。2.Its difficult for us to learn a lesson in life_ weve actually had that lesson.(2007天津)A.until B.since C.before D.when答案是A,为什么不能选C。望大伙给个说法解析:很多时候英语单选题的答案并不是说只有这个选项可以将句意补充完整,或者说只有这个选项符合要求,而是因为它是最符合逻辑、语法、搭配等多方面的要求的一个,这个题目中until和before都可以将句子补充完整,但从句意逻辑上来比较一下,如果用before的话,意思就只有“在我们真切地经历一次教训之前,我们很难领会到其中真理”。但如果用until的话,句子的意思就更加有层次、更加丰富了,他可以直接翻译为“直到我们真切地经历过一次教训,我们才会领会到其中真理”,这就直接表达出了前面的答案所要表达的真正意思,也就是说这句话包含了前者的真正意义,像这种能够包含另一个正确答案意思的答案,一般就是最佳答案了。换句话说,包容性最强的正确答案就是最佳答案3. There were some chairs left over _A_ everyone had sat down.(2008四川)当每人都坐下时那里还有些空位置,had sat 过去完成式A. when B. until C. that D. where4. The telephone _B_, but by the time I got indoors, it stopped.A. had rung B. was ringing(过去进行时) C. rings D. has rung5.Never cross the street against a light _you dont see any traffic coming.A.in case B.so that C.even though D. even ifeven if一般引导的是把握不大或假设的事情, even though引出的是事实。though 常表示一些已经确定的消息,而if由它本身所带的“如果”的含义,表示了一种对假设信息的不确定。 本题里的you dont see any traffic coming.,翻译过来应该是“就算你没看见有车过来,”当你过马路等红灯的时候,没车过来是经常会发生的事情,是个事实,不是把握性不大的事情,因此用even though,不用if。给你几个例句:Shes going to have problems finding a job even if her gets she A levels. 就算她考试成绩都是A,她找工作还会碰到问题。(考A是假设的情况)Even though hes 24 now, hes still like a little child.尽管他24岁了,但他仍然像个孩子。(他24岁了是事实)Even though he knows it, hell not let out the secret.(他知道这个秘密). Even if he knows it, hell not let out the secret.(不确定他是否知道这个秘密).6. _ the Internet is of great help, I dont think its a good idea to spend too much time on it. A. If B. While C. Because D. As 本题选择B,但是我不太明白D为什么不可以?感谢您的回答!本句的意思是虽然网络对人的帮助很大,但是我并不认为在网络上花费太多时间是个好注意.请注意句子含义的转折性.只有B有
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