状语从句中的when,while ,as用法汇总
状语从句归纳总结
状语从句归纳总结状语从句归纳总结：（as用法）一、时间状语从句：1、连接词when、while、as⑴when ①正当…时候be about to…ving…②从句动词先于或后于主语动作⑵while: 可表示对比（从句只用连续性动词）⑶as: “一边一边”“随着”省略句中: eg: As time goes on…随着时间的推移As a boy,hewao hopeless at English.2、before,afterbefore常用句型:It is/was/will be…beforeeg: It will be 5 years before we meet again.3、till，until①用于肯定句中“直到…为止”，主句谓语为持续性动词②用于否定句中“直到…才”，主句谓语为短暂性动词（until,till 可用before代替）③Not until位于句首倒装④强调句型只用until二、地点状语从句:where,wherever,everywhere也可引导定语从句：状语从句：We shall go where the condition are poor.定语从句：We shall go the place where the condition are poor.三、原因状语从句1、because\since\as⑴①用why提问②强调句中③关联词“not…but”④与“just”等副词连用eg:You shouldn’t any only because you had much.⑵since引导从句常放句首，往往表示对方已知的让步原因关系，主从时态一般相同⑶as从句放句首2、now(that) 既然3、considering that,seeing (that):与since,now that意相近: “鉴于…”“考虑到…”4、not that…,but that…“不是因为…而是因为…”四、目的状语从句1、that,so that,in order that“为了，以便”⑴从句中往往出现情态动词：can\could\may\might⑵当主从句的主语一致时，可转换为相应动词不定式结构：so as to\in order to2、in case,for fear that,lest“以防、以免、万一..”从句是肯定句五、结果状语从句1、so,that,so thatso that可以引导结果状语从句和目的状语从句，区别在于：目的状从中有情动（结果状从前有“，”号）2、so…thatsuch a\an +形+单名=so+形+a\an+单名“如此…以至于”3、such…thatsuch…that（状从）such…as（定从）4、such that （是这样…以致）六、条件状语从句：主句中用一般将来时，从句中用一般现在时或一般过去时1、if正面条件“如果”2、unless. 反面条件=if not 主句为否定意味，从句为肯定句（从句也可用否定结构）unless做介词“除非，如果不”3、so\as long as,on condition that “条件是…”“只要..”4、in case既可引导目的状，又可引导条件状=”if it happened that…”5、providing,provided that, suppsing,suppose (that),given (that) “如果，只要，假如”七、方式状语从句1、as,just as“如…”“正如…一样”Do just as you like2、as if, as though （虚拟语气）八、比较状语从句1、as…as,the same as. 否定句用not so\as…as,not the same as从句中常用省略句: eg:He runs as fast as he can.2、than3、the more…the more…“越…越…”4、more than九、让步状语从句1、although,though.句中不出现but，可出现still\yet（副词）though的位置较灵活，可倒装2、even if,even though“即使”even if表主观，时态往往用于将来even though通常表客观上的，往往表过去事实3、no matter wh…只用于让步状语从句wh..ever 让步状从/名词性从句4、as特殊倒状5、while,whereas突出对比6、if(=even if) 强调部分(n.\adj.\adv.\v.) +as+主+谓（可以是情动）。
When,while,as 引导的状语从句的用法。
When，while ，as引导的时间状语从句的用法一、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。
while when和as的用法区别
as when while 的区别和用法as when while的用法一、as的意思是“正当……时候”,它既可表示一个具体的时间点，也可以表示一段时间。
as可表示主句和从句的动作同时发生或同时持续，即“点点重合”“线线重合”；又可表示一个动作发生在另一个动作的持续过程中，即“点线重合”，但不能表示两个动作一前一后发生。
如果主句和从句的谓语动词都表示持续性的动作，二者均可用进行时，也可以一个用进行时，一个用一般时或者都用一般时。
1、As I got on the bus，he got off. 我上车，他下车。
（点点重合）两个动作都是非延续性的2、He was writing as I was reading. 我看书时，他在写字。
（线线重合）两个动作都是延续性的3、The students were talking as the teacher came in. 老师进来时，学生们正在讲话。
（点线重合）前一个动作是延续性的，而后一个动作时非延续性的二、while的意思是“在……同时（at the same time that )”“在……期间(for as long as, during the time that）”。
从while的本身词义来看，它只能表示一段时间，不能表示具体的时间点。
在时间上可以是“线线重合”或“点线重合”，但不能表示“点点重合”。
例如：1、He was watching TV while she was cooking. 她做饭时，他在看电视。
（线线重合）2、He was waiting for me while I was working. 我工作的时候，他正等着我。
（线线重合）3、He asked me a question while I was speaking. 我在讲话时，他问了我一个问题。
（点线重合）三、when的意思是“当……时候（at the time that）”“无论什么时候（whenever）” “一……就……（as soon as ）” “在……以后（after）”。
when、 as、 while引导的时间状语从句
二.选择最佳答案： 1.She thought I was praising her child， _____，in fact，I was scolding him for his bad behaviors at school. A.what B.while C.so that D.therefore 2.I do every single bit of housework ____ my husband Bob just does the dishes now and then.(2004全国卷II35) A.while B.since C.when D.as 3.______ it is expected that students come university with the ability to take a good set of notes，this is not always the case. A.When B.As C.For D.While
when、 as、 while 引导的时间状语从 句
1. when、 as、 while引导的时间状语从句分析： (1) when引导时间状语从句时表示“当……的 时候”， when既可以指时间段也可指时间点， 从句中既可用延续性动词又可用非延续性动词， 且动作既可和主句的动作同时发生又可在主句的 动作之前或之后发生， 注意体会如下例句： I’ll call you when I get there. 我一到那里 就给你打电话。
三、While作并列连词用，意思为“而，然而”， 表对比。而but表转折。注意用心比较体会while 与but的句中用意 1.Some people waste food while others haven't enough. 有些人很费粮食，然而有些人却吃不饱。 2.The son was having a good meal at home，while the parents were working in the fields. 儿子在家吃好饭而父母却在田里辛勤劳作。 3.I ought to have helped her，but I never could. 我本该帮她但没能。
when,while和as引导时间状语从句的用法
when, while 和as 引导时间状语从句的用法一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。
5. He was on the point of leaving when someone knocked at the door.他正要走，这时有人敲门。
6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
7. I had hardly[scarcely] closed my eyes when someone knocked at the door.我刚一闭上眼，就有人在敲门了。
根据以上的例句，我们可以总结出一点：when 从句的A事件，相当于另一个事件B发生的时间点。
也就是说，when 从句的重点不在动作本身发生的状态，而只是把它作为一个时间点，所以when 多数情况下用的是一般过去时，则不用正在进行时。
因为如果用正在进行时，它表示的就是一段时间而不是一个时间点了。
根据这一点，有的文章补充说：when 从句的动词大多是瞬时动词。
这种说法也可以参照。
实际上，when 从句也可以有其它的时态，但几乎也不用进行时，因为它也只是作为一个时间参照点。
as, while,when 与让步状语从句
as, while,when 与让步状语从句1．as引导的让步状语从句，句子要求用倒装结构，此时的as相当于though，但比though引导的让步状语从句语意更强烈，表现力更强。
如：1）形容词＋as＋主语（代词）＋系动词，＋主句Small as it was，the army had great fighting capacity．这支军队虽然很小，战斗力却很强。
Young as he is，he knows many things．他年纪虽小，知道的事可不少。
2）副词或动词原形＋as＋主语……，＋主句Much as I like it，I will not buy it．虽然我很喜欢这东西，但不想买它。
Try as I would，I couldn't lift the stone．不管我使多大劲也搬不起这块石头。
Do as I might，I could not finish the duty．虽然我努力做了，但仍未完成这项任务。
2．while引导的让步状语从句，while相当于though ／although。
如：While Smith loves his daughter，he is strict with her．虽然史密斯爱他的女儿，但仍严格要求她。
While I admit his good points，I can see his shortcoming．虽然我承认他的优点，但我还是看到了他的缺点。
While I believe it，I must consider．我虽信，但还要考虑一下。
3．when引导的让步状语从句，when相当于though ／although。
如：We'll try to finish the work in time when we are short of manpower．虽然我们缺乏人力，但我们还是要按时完成这项工作。
We had only two books when we needed five．虽然我们需要五本书，可我们却只有两本。
【英语知识点】when,while和as引导时间状语从句的用法
when, while 和 as 引导时间状语从句的用法一、when 的用法如果只从现象来看，when 从句用的最多的是一般过去时，而主句的时态没有限制,根据具体情况而定。
1. When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想。
2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。
3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。
5. He was on the point of leaving when someone knocked at the door.他正要走，这时有人敲门。
6. I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
7. I had hardly[scarcely] closed my eyes when someone knocked at the door.我刚一闭上眼，就有人在敲门了。
根据以上的例句，我们可以总结出一点：when 从句的A事件，相当于另一个事件B 发生的时间点。
也就是说，when 从句的重点不在动作本身发生的状态，而只是把它作为一个时间点，所以when 多数情况下用的是一般过去时，则不用正在进行时。
因为如果用正在进行时，它表示的就是一段时间而不是一个时间点了。
根据这一点，有的文章补充说：when 从句的动词大多是瞬时动词。
这种说法也可以参照。
实际上，when 从句也可以有其它的时态，但几乎也不用进行时，因为它也只是作为一个时间参照点。
when as while用法区别
when as while 用法区别，各自意思hen，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。
①Why 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。
④The 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。
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状语从句中的when, while和as的用法一．when，while，as在时间状语从句中的区别：①三者均可表示“当……的时候”，如果主句表示的是短暂的动作，而从句表示的是一段时间，三者可通用。
如：I met Kang Li as／when／while I was walking along the street．当我沿街散步时碰见了康丽。
②when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。
如：It was snowing when we got to the airport．当我们到达机场时，天正下着雪。
（不能用while）③as强调主句与从句表示的动作同时发生，as常表示“随着……”；“一边……，一边……；while强调主句表示的动作持续于while所指的整个时间内；when 可指主、从句所述动作同时或先后发生。
如：As the time went on，the weather got worse．（as表示“随着……”之意）He sang as he went along．他边走边唱。
Please write while I read．我读的时候，请写下来。
When he reached home，he had a little rest．回到家后，他休息了一会儿。
④when用于表示“一……就……”的句型中（指过去的事情）。
somebody had hardly（＝scarcely）done …when．．．＝Hardly ／Scarcely had somebody done …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。
二.when, while和as都可引导让步状语从句：①when引导让步状语从句，意为“尽管，虽然”相当于though或although: They stopped trying when they might have succeeded next time.②while引导让步状语从句，相当于although ，是较为正式的书面语:While I am willing to go, I would like it better that you went.③as引导让步状语从句必须倒装，从句中的表语，状语或动词原形置于句首，若表语为名词，前置时省略冠词。
Child as he is, he knows a lot.Much as I like it, I will not buy it, for it’s too expensive.Try as he might, he could n’t find a job.三.when和while可用作并列连词:①when作并列连词，意为“突然，正在那个时候”常运用于以下句型中：Somebody be about to do…when…Somebody be on the point of doing…when…Somebody be doing… when…Somebody had done…when…We were having a meeting when someone broke in.We were about to set off on our way, when it suddenly began to rain.②while作并列连词，意为“而，却”，表示对比。
He likes pop music, while I am fond of music.四.when和as用于原因状语从句中:①when=since, now that… “既然”Why do you want a new job when you’ve got such a good one already?②as意为“因为”，指说话双方都知道的原因。
As he was not ready in time, we went without him.组题练习：1. Success came ______ she began to play leading parts in radio plays.A. WhileB. asC. whenD. if2. The atmosphere gets thinner and thinner _______ the height increases.A. WhenB. asC. whileD. since3. I was just about to go to sleep______ there was a loud knock on the door.A. WhileB. whenC. asD. since4. They were surprised that a child should work out the problem_____ they themselvescouldn’t.A. WhenB. whereC. untilD. while5. We were swimming in the lake______ suddenly the storm started.A. WhenB. whileC. untilD. before6. I do every single bit of housework_____ my husband Bob just does the dishes now and then.A. SinceB. whileC. whenD. as7. _____ I accept that he is not perfect, I do actually like the person.A. WhileB. SinceC. BeforeD. Unless8. Jasmine was holidaying with her family in a wildlife park__ she was bitten on the leg by a lion.A. WhenB. whileC. sinceD. once9. _____modeling business is by no means easy to get into, the good model will always be in demand.A. WhileB. SinceC. AsD. If10. All gases and most liquids and solids expand ______ heated.A. asB. whileC. beforeD. when11. We have only three books______ we need five.A. as ifB. ifC. whenD. even though12.How can we explain it to you_____?A. while you are listeningB. unless you will listenC. a s you won’t listenD. when you won’t listen13._______ I had to work to support my family.A. When I was a little childB. While I was a little childC. As I was a little childD. Before I was a little child14._____________, helicopters flew to the burning building.A. While the firefighters were trying to control the fireB. As the firefighters were trying to control the fireC. As soon as the firefighters were trying to control the fireD. After the firefighters had controlled the fire15. The husband was looking after the baby__________.A. after his wife cooked in the kitchenB. as his wife was cooking in the kitchenC. when his wife was cooking in the kitchenD. while his wife was cooking in the kitchen16. Look at the sun. It is shining._______ it’s sunny, let’s go for a walk.A. asB. whenC. ifD. as soon as17. The sad mother sat on the roadside，shouting_______ she was crying.A. whatB. whenC. asD. which18. Hardly had we entered the room ______ it began to rain.A. whileB. asC. thenD. when19. ___________, he does get annoyed with her sometimes.A. Although much he likes herB. Much although he likes herC. As he likes her muchD. Much as he likes her20.______ years go by，China is getting stronger and richer. A. When B. As C. While D. SinceKeys:1---10 CBBDA/ BAAAD 11-----20 CDAAD/ ACDDB。