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一、句子成分：1.主语：主语（Subject）是一个句子所叙述的主体，一般位于句首。
主语可由名词、代词、数词、不定式、动名词、名词化的形容词和主语从句等表示。
例如:The sun rises in the east。
（名词）He likes dancing. （代词）Twenty years is a short time in history。
（数词）Seeing is believing. （动名词）To see is to believe. （不定式）What he needs is a book. （主语从句)2. 谓语谓语 (Predicate) 说明主语所做的动作或具有的特征和状态。
动词在句中作谓语，一般放在主语之后。
谓语的构成如下:1、简单谓语：由一个动词或动词短语构成。
如：He practices running every morning。
The plane took off at ten o'clock。
2、复合谓语:（1)由情态动词或其他助动词加动词原形构成，或由各种时态构成。
如：You may keep the book for two weeks.He has caught a bad cold.（2）由系动词加表语构成。
如:We are students.注意：谓语与主语在人称与数方面要保持一致3．表语表语（Predicative)用以说明主语的性质、特征、状态与身份,它一般位于系动词（如be， become， get, look, grow， turn, seem等）之后.例如：He is a teacher。
注意：系动词（Linking verb）用于连接主语和表语，说明主语的状态，性质特征和身份等常见的系动词有： be， sound（听起来）， look（看起来）， feel（摸起来）,smell（闻起来），taste（尝、吃起来）， remain（保持，仍是）， feel（感觉）….It sounds a good idea。
初中英语之 --- 状语从句1时间状语从句：在一个句子中作时间状语的句子。
引导词:when（当…时候）while（当…时候）as（当…时候）after（在…以后）before（在…以前｝ as soon as（—…就｝ since（自从…到现在）till /until（直到…才｝by the time（到…为止）构成：引导同+陈述语序句子2原因状语从句：在一个句子中作原因语的句子，译作“因为”。
连接词:由连词because, s ince, as引导,也可由for引导。
举例：Ididn’ t go to school y esterday bee ause I was i II.3条件状语从句连接词:if如果,u nless （=if n ot＞除非。
（主将从现原则）举例：If it doesn ’ t rai n tomorrow,we will go h iking.4目的、结果状语从句目的状语从句是指在一个句子中充当目的状语的句子，译作“以此來.......”。
结果状语从句是指在一个句子中充当结果状语的句子，译作“所以......或者如此... 以致于”。
引导词：so that, s o…that, in order thatHe came early so that he c ould get a g ood seat.The boy is so I ittle that h e can't go t o school alo ne.5让步状语从句让步状语从句是指在句子中作让步的状语的句子连接词:though,although, e ven though,even if 译作“尽管 ...... ”举例：Altho ugh he is ri ch, he is no t happy.状语从句其它引导词1.时间状语从句常用引导词:when, as, while, as soon as, while，before,after, sine e , till,until 特殊引导同：.. ... 就... ：the minute, the moment, the second，eg: The moment she s aw the littl e dog, she f ell in love with it.每次... :every timel didn’t real ize how spec ial my mot he r was until I became anadult.While John was wat ching TV, hi s wife was c ooking.The c hildren ran away from th e orchard （果园）the moment they saw the guard.Ever y time I listen to your advice, I get into trouble.2.地点状语从句常用引导同：where特殊引导同：whereve r无论哪里，anywhere 任何地方，everywhere 每个地方A new scho ol will be b uilt where i t was a shop ping center.Wherever yo u go, you sh ould work hard.状语从句练习单项选择1.John does n't letever ybodyinthe kitchen __________ h e could makehis sur prisedinner fortheparty.A. which B. when C. so that D. as if 2.I wouldt hankit __________ you call back this a fternoon for the doctor5 smeeting.A.until B. if C. when D. that3.Asfar as Iam concerned （就我而言），education is about learning and the more you learn,—____ A. the betterlife will you get B. the betterlife you will ge tC. you will get the bet ter lifeD.will you get the bet ter life4.Af ter the war, a new school wasbuilt _____________ t here had once be en（曾经有）a theatre.A. that B. where C . which D. whe n5.—Is Mr.Smith in the office?—Yes , __________ he is in charg e of the office, he mustbe there.A.since B. how ever C. whether D. for 6.As your good friendJ will do ____________help you.A. that I can to B. what I canto C. all that I can D. what I can7.Someone called me up in the middle ofthe night, b ut they hung up（挂断电话）____________ I coul d answer the phone.A.as B.since C. until D. before8.We must hurry up __________catchup with the last train.A. that B. so that to C. in order that D. in ord er toLondon 9.No m atter ________ h ard it ma y be, I will carry it out .A. what B. whatev er C.how D. however 1 0. _________you may do, you must do itwell.A. Which B.Whenever C. What ever D.WhenM. ________ you are so weak, you’d better sta y at home.A.Since B. For C. B ecause D. Though 1 5.1saw Mr.Smith last S unday. We had not seen each other ____________ I left .A. as B. before C.since D. till 16.1’11 be back before you ________ .A.will leave B will have left C.leave D. would lea vel7.If the weather ____________ tomor row, we will go picnic i n the centra 1 park.A wil 1 be fine Bis fine Cis going to be fine D h ave been fine18. ________________________ They wen t on working it was late at night.A. eve n if B.as if C. however D. as tho ughl9.l hurr ied _____________ I wouldn't b e late for c lass.A. sine e B. sotha t C.as if D . unless20.T he volleybal I match will be put off if it __________ .A. will r ain B. rain s C. r ained D. is raining【实例解析】1.（2004年北京市海淀区中考试题）You will sta y healthy ________ you do more exerci se, such as running and walking.A.ifB. howC. beforeD. where2.（2004年江丙省中考试题）…Shall we go on wor king?Ye s, _________ I prefer to have a rest.A. whenB. ifC. be causeD. th ough3.（2004年徐州市中考试题）N one of us kn ew what had happened ___________ they told us abo ut it.A. w henB. unti IC. afterD. though4.（2004年泉州市中考试题）••-1 ho pe you’ll en joy your tri p, dear!—Thank you,mum. Til gi ve you a cal I ___________ I get there.A. untilB. as soon a sC. sinceD. till【中考演练】一.单项填空1. ______ he z s old, he c an still car ry this heav y bag.A. T houghB. Si neeC. ForD. So2.•■-Do you know if he ______ to play ba sket ball wi th us?---1 think he wi II come if h e _______ fre e tomorrow.A. comes; i sB. comes;will beC.will come;isD. will come; will b e3.In the z oo if a chil d _____ into the water a nd can't swi m, the dolph ins may come up _________ him.A. will fall; to he IpB. fall s; to helpC. will fall; help D . falls; hel ping4.1don z t remember _________ he worked in th at city when he was youn g.A. whatB. which C . where D.who5.We wil I stay at ho me if my aunt __________ to visit us t omorrow.esB. c omeC. will comeD. is coming6.Th e police ask ed the child ren _______ cross the st reet _________ the traffi c lights tur ned green.A. not; befo reB. don't; whenC. n ot to; untilD. not; af ter7.1was late for cla ss yesterday ________ t he re was somet hing wrong w ith my bike.A. when B . that C. u ntil D. bee ause8.I’ll go swimming with you if I _________ f ree tomorrow .A. will b eB. shall beC. am D . was9.In t he exam, the ________ yo u are, _______ the ________ mistakes y ou will make .A. carefu I; littleB. more ca reful; fewes tC. more c areful; fewe rD. more c a ref u I; less10.You shou Id finish yo ur lessons _______ you g o out to pal y.A. beforeB. afterC. whenD.while11.1hurried _____ I wouldn't be late for class.A.sinceB. s o thatC. a s ifD. uni ess12.When you read the book, you'd better make a mark ________ you have any questio ns.A. whi chB. thatC. where D . though13.The teacher raised his v oice ________ a ll the stu dents could hear him.A. forB. s o thatC. b ecauseD. i n order14.H e took off h is coat ________ h e felt hot.A. be causeB. asC. ifD.since15.It is ______ th at we'd like to go out f or a walk.A. a lovely dayB. t oo lovely a dayC. so lovely a dayD. such Io vely a day16 . Mary had _______ m uch w ork to do th at she staye d at her off ice all day.A. suchB.soC. tooD. very17.______ I fel t very tired , I tried to finish the work.A. AlthoughB.BecauseC.AsD. As if18.______ t he day went on, the weat her got wors e.A. WithB. SinceC. WhileD.As19.______ well you c an drive, yo u must drive carefully.A. So long asB.ln order tha tC. No ma tter how D . The momentBeijing20. Write to me as soon as you _________ to.A . will get B. get C. g etting D. g ot二.根据中文意思完成下列英语句子1.不管他跟我开什麽玩笑，我都不生气。
状语从句考点+例题-全面解析（word）一、初中英语状语从句1．--Where is the comic book?--I brought it to you ________you were in the reading room yesterday.A．when B．if C．because D．before【答案】A【解析】句意：-漫画书在哪里？-昨天当你在阅览室的时候我就拿给你了。
when当…时候；if如果，引导条件状语从句；because因为，引导原因状语从句；before在…之前，引导时间状语从句。
根据句意可知，这里表示“当你在阅览室的时候”，故应选A。
2．---Mom, shall we have supper now?---Oh, we won’t have supper_______ your dad comes back.A．until B．since C．while D．after【答案】A【解析】试题分析：句意：-妈妈，我们现在吃晚饭好吗？ -哦，直到你爸爸回来我们才可以吃晚饭。
until直到；since自从；while当……的时候；after在……之后。
Not…until直到……才，是一个固定句型，所以选A。
考点：考查连词。
3．—I don ' t know if Sam tomorrow.—Don't worry. I will tell you as soon as he .A．will come; comes B．comes; will comeC．will come; will come D．comes; comes【答案】A【解析】【详解】句意：——我不知道萨姆明天是否会来。
——别担心，他一来我就告诉你。
第一个句子为if引导的宾语从句，根据从句中的时间状语tomorrow判断，从句的时态为一般将来时，排除B,D；第二个句子是as soon as引导的时间状语从句，遵循“主将从现”的原则，本句的主句是一般将来时，as soon as引导的从句要用一般现在时，故答案为A。
英语语法口诀第一部分定语从句1.定语从句概述a)定语从句起定语修饰作用，分为限定性和非限定性两种，非限定性通常有逗号验证I have plenty of friends who are from foreign countries.I have plenty of friends, some of whom are from foreign countries.b)先行词，关系词，定语从句，如此一线性The man that instructed me is a famous expert.c)关系词分为关系代词和关系副词两种，关系代词作主宾表定，关系副词作状语才行：关系词三大作用：1.代替先行词；2.引导从句；3.在从句中充当成分The murder was caught alive in the house where he killed three women.2.三步法选关系词a)首先找出先行词，带入从句看成分是其次，（主表宾定不合适，状语必然是，用关系副词）再由先行词及其成分定关系词I will never forget the day when I met the president.3.关系代词的选用a)人用that whom who。
b)which that 用于物c)that 真是个人物，既充人又充物；既当宾又当主d)whom 只做宾，which that who 既宾又主e)whose 作定语（=名词+of which），不分人或物The tall house whose windows face the south is my office.4.关系副词的选用a)先行词the time，需用关系副词时，用when 才可以若关系词在从句中充当状语，则关系词应用when，the time +when（=on which）I will never forget the days when I lived with you happily.I will never forget the days which I spent learning English .b)先行词the place，需用关系副词时，where来效力若关系词在从句中充当状语。
状语从句（2h）教学目标：掌握9大状语从句及其中重要的引导词与句型。
由于高考中状语从句经常和从句的时态语态，动词短语的搭配，以及状语从句的省略，虚拟语气与倒装一起考查。
因此必须掌握好：1 时间状语从句中各种引导词引导的主句与从句的时态的判断2 地点状语从句中表示抽象含义时从句必须在主句之前3 原因状语从句中because，as，now that的位置问题4 目的状语从句中的so that与在结果状语从句中的区分5 结果状语从句中的so/such…that…的特殊结构及其倒装6 条件状语从句中的if，unless的用法7 方式状语从句中的虚拟语气的用法8 让步状语从句中的as, though做引导词时的倒装用法教学重点：1 掌握常用的状语从句中的引导词2 判断状语从句中的时态3 状语从句中的倒装情况：no sooner…than, hardly/scarcely…when, not…until用于句首时的倒装；结果状语从句中so/such置于句首时的倒装情况；as/though引导的让步状语从句的倒装情况4 as if/though引导的方式状语从句中的虚拟语气教学进程：导入：状语从句在句子中作状语，修饰谓语。
㈠时间状语从句⒈回顾有哪些词可以引导时间状语从句—when, while, as表示“当…时”; immediately, instantly, as soon as, directly, the moment, no sooner than, hardly when, scarcely when, once表示“一…就…”；till, until, not until表示“直到…才”；before 表示“还没来得及…就…”，“不到…就…”；since表示“自从…”；every time, each time, next time, the first time, any time, all the time表示“每当…”，“每次…”，“下次…”等等⒉状语从句中的时态的判断方法：⑴过去，现在，将来⑵延续性与非延续性/时间点与时间段⑶主从句中的谓语动词的先后关系⑷判断开始时间与截止时间⒊when, while, as都可以表示主从句动作同时进行(口头造句举例)如：when the music fades away, people tide away.She sat there alone while others were all dancing.He dances joyfully as the music goes.当主句动词为短暂性，从句动词用延续性动词的进行时态表示一段时间内的动作时，三个词可互换。
(完整版)高中英语状语从句用法详细解析(word版可编辑修改)编辑整理：尊敬的读者朋友们：这里是精品文档编辑中心，本文档内容是由我和我的同事精心编辑整理后发布的，发布之前我们对文中内容进行仔细校对，但是难免会有疏漏的地方，但是任然希望（(完整版)高中英语状语从句用法详细解析(word版可编辑修改)）的内容能够给您的工作和学习带来便利。
同时也真诚的希望收到您的建议和反馈，这将是我们进步的源泉，前进的动力。
本文可编辑可修改，如果觉得对您有帮助请收藏以便随时查阅，最后祝您生活愉快业绩进步，以下为(完整版)高中英语状语从句用法详细解析(word版可编辑修改)的全部内容。
高中英语状语从句用法详细解析一、定义：在句中作状语的从句是状语从句,修饰主句中的动词、形容词或副词等。
状语从句由从属连词引导，从属连词在句中不充当句子成分，只起连接作用，状语从句放在句首时，要用逗号，放在句尾时不用。
二、分类根据意义上的不同，状语从句可分为：①时间状语从句②地点状语从句③原因状语从句④目的状语从句⑤条件状语从句⑥结果状语从句⑦让步状语从句⑧方式状语从句⑨比较状语从句三、时间状语从句（一）引导时间状语从句的连词有：as， when（whenever）， before， after, as soon as, until(till）, since， every time, once。
（二）、“as" as, when, while都有“当……的时候”，可以互用When she was a child。
While she was a child. She Lived in Paris.As she was a child。
as有“一边…一边"的意思He sang as he walked。
“when"When the clock struck twelve， all the lights went out。
名词性从句及状语从句总结(完整版)编辑整理：尊敬的读者朋友们：这里是精品文档编辑中心，本文档内容是由我和我的同事精心编辑整理后发布的，发布之前我们对文中内容进行仔细校对，但是难免会有疏漏的地方，但是任然希望（名词性从句及状语从句总结(完整版)）的内容能够给您的工作和学习带来便利。
同时也真诚的希望收到您的建议和反馈，这将是我们进步的源泉，前进的动力。
本文可编辑可修改，如果觉得对您有帮助请收藏以便随时查阅，最后祝您生活愉快业绩进步，以下为名词性从句及状语从句总结(完整版)的全部内容。
判断句子类型。
He looked unhappy at that time。
My favourite sports are swimming and skating。
I am very good at English。
4. I was so pleased to hear from you。
I studied in Guangming Primary School from 1984 to 1990.This morning we met at the school gate and went there together.The time passed quickly。
Great changes have taken place in our hometown these years.The car didn’t stop but drove off at great speed。
Last year I won first prize in the school computer competition。
In my spare time I enjoy listening to popular music and collecting stamps。
The other day my brother and I went to the cinema by bicycle。
状语从句（Adverbial Clause）状语从句指句子用作状语时，起副词作用的句子。
它可以修饰谓语、非谓语动词、定语、状语或整个句子。
根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。
状语从句一般由连词(从属连词)引导，也可以由词组引起。
从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。
状语从句的种类状语从句可分为：1.时间状语从句；(adverbial clause of time)2.地点状语从句；(adverbial clause of place)3.原因状语从句；(adverbial clause of cause)4.条件状语从句；(adverbial clause of condition)5.目的状语从句；(adverbial clause of purpose)6.让步状语从句；(adverbial clause of concession)7.比较状语从句；(adverbial clause of comparison)8.方式状语从句；(adverbial clause of manner)9.结果状语从句。
(adverbial clause of result)[编辑本段]状语从句的时态特点一般情况下，时间和条件状语从句的谓语动词一般用“一般现在时”表示“一般将来时”，用“现在完成时”表示“将来完成时”。
例如：I will call you as soon as I arrive in Beijing. 我一到北京就给你打电话。
（这是由as soon as引导的时间状语从句，从句中的谓语动词arrive是一般现在时，表示一般将来时，决不可用will arrive）As soon as I have finished this work, I will go home. 我一完成此工作，就回家。
（从句中的谓语动词用现在完成时have finished，表示将来完成时,决不可用will have finished）If he comes back, please let me know.如果他回来了，请通知我。
【知识衔接】————初高中课程解读————————初中知识回顾————一、状语从句概述二、状语从句的分类1. 时间状语从句用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。
when/while/as (当……时)when引导的从句的谓语动词可以是延续性动词，又可以是瞬时动词。
when有时表示“就在那时”。
1. When she came in, I stopped eating. (瞬时动词)当她进来的时候，我停下吃东西。
2. When I lived in the countryside, I used to carry some water for him. (延续性动词）当我住在乡下的时候，我经常带些水给他。
while引导的从句的谓语动作必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。
while有时还可以表示对比。
1. While my wife was reading the newspaper, I was watching TV. (同时发生)当我妻子在读报纸的时候，我在看电视。
2. I like playing football while you like playing basketball. （对比）我喜欢踢足球，而你喜欢打篮球。
as表示“一边……一边”，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强调“一先一后”。
1. We always sing as we walk. (一边……一边)我们总是边唱边走。
2. As we were going out, it began to snow.（as强调句中两个动作紧接着先后发生）我们刚一出门就开始下雪了。
before (在……之前)before的本意为“在……之前”，根据具体语境还可理解为“就/才……”1.Make sure that all the lights are off before you go to bed.睡前确定所有的灯都关上。
【英语】人教版中考英语状语从句（word）一、初中英语状语从句1．China Dream will be able to come true we try our best.A．unless B．until C．although D．as long as【答案】D【解析】【详解】句意：只要我们尽全力，中国梦将会实现。
考查连词。
A. unless除非；B. until直到；C. although虽然；D. as long as只要。
根据句意可知，是只要我们尽全力，中国梦将会实现。
故选D2．The Italian woman didn’t feel a culture shock____it was her first time to Shanghai. A．though B．since C．if D．when【答案】A【解析】句意：这个意大利妇女没有感到一种文化冲击，尽管她是第一次来上海。
A. though尽管；B. since自从；C. if 是否，如果；D. when当---时候；根据The Italian woman didn’t feel a culture shock这个意大利妇女没有感到一种文化冲击，和it was her first time to Shanghai.她是第一次来上海之间用though 引导让步关系状语从句；故选A3． He made a mistake, but then he took action to change the situation ________ it got worse. A．until B．when C．before D．because【答案】C【解析】试题分析：句意：他犯了一个错误，但他在它变得更糟前采取了行动改变现状。
Until直到；when当···时；before在···之前；because因为。
状语(adverbial)是句子的重要修饰成分。
状语是谓语里的另一个附加成分，它附加在谓语中心语的前面，从情况、时间、处所、方式、条件、对象、肯定、否定、范围和程度等方面对谓语中心进行修饰或限制。
在英语中，状语修饰动词、形容词、副词等的句子成分。
状语的功用：状语说明地点、时间、原因、目的、结果、条件、方向、程度、方式和伴随状况等。
状语一般由副词、介词短语、分词和分词短语、不定式或相当于副词的词或短语来担当。
其位置一般放在句末，但也可放在句首或句中。
副词是一种用来修饰动词,形容词,副词或全句的词,说明时间,地点,程度,方式等概念。
1.副词一般在句子中做状语．He speaks English very well. 他英语说得非常好.中的very是程度副词，用来修饰well。
very well是修饰speak的程度状语。
2. 不定式在句子中可以作目的状语。
I come specially to see you.我专门来看你.3.介词短语Ten years ago, She began to live in Dalian.十年前,她开始住在大连。
The boy was praised for his bravery.4.从句作状语When she was 12 years old, she began to live in Dalian.If I am not busy tomorrow, I will play football with you.5.分词作状语Having had a quarrel with his wife, he left home in a bad temper。
Inhibited in one direction, it now seems that the Mississippi is about to take another. 状语简介概述状语与定语相同的地方是,都是前者附加成分;不同的地方是,它是谓语里的附加成分,而定语是主语或宾语里的附加成分.从句子的层次上看,状语是在第二个层次和第三个层次里的成分,有时甚至是更低层次的成分.状语的构成状语的构成经常充当状语的有形容词,副词,时间处所名词,能愿动词,指示代词,以及方位短语,介词短语,动宾短语,谓词性联合短语,谓词性偏正短语,谓词性主谓短语等.含有动量词的数量短语以及重叠式的数量短语(不论动量,物量)也可以充当状语.此外,少数名词带上表比况的助词也可以作状语.状语的书面标志——"地"状语的书面标志是结构助词"地".状语后面带或者是不带"地",情况比较复杂.一般讲来,数量短语,主谓短语,动宾短语等作状语时,大都带"地";而介词短语,方位短语,能愿动词,时间处所名词作状语时不能带"地",副词,单音节形容词作状语一般也不带"地".多层状语如果一个中心语前面有好几个状语(多层状语),那就应当注意它们的语序.多层状语的状语个数一般比多层定语的定语个数要少些,其语序也比多层定语的语序要灵活一些.多层状语的一般语序:a.表时间的名词或方位短语,介词短语;b.副词.c.表处所的介词短语或名词,方位短语;d.表情态的形容词或谓词短语;e.表对象的介词短语.其中副词的位置较为灵活,也可放置在第三项之后.一般状语和句首状语状语在句子中有两种位置:一种是在主语之后,谓语中心之前,如上文所举各例,这是状语的一般位置;另一种是放在主语的前面的,这是状语的特殊位置,这种状语可称"句首状语".状语的分类状语按其修饰的功能不同可分为八大类：时间状语，地点状语，条件状语，原因状语，目的状语，结果状语，让步状语和比较状语时间状语从句要点: 时间状语从句，由以下连词引导：when ，while，as，after ，before，as soon as，since ，till /until by the time 在时间状语从句中，要注意时态一致。
一般情况下主句是将来时的时候，从句要用一般现在时。
1.when当.....的时候Mozart started writing music when he was four years old.2.while当.....时He visited a lot of places while he was traveling.3. as在.....的同时；一边....一边.....He smiled as he stood up.4.after在....之后He left the classroom after he had finished his homework the other day.5.before 在......之前Mr. Brown had worked in a bank for a year before he came here.6. as soon as 一.....就（scarcely/hardly...when,no sooner than,the minute/moment,on/upon,directly等等）We began to work as soon as we got there.I will write to you as soon as I get home.7.since 自......以来到现在表示自过去的一个起点时间到目前(说话时间)为止的一段持续时间。
主句一般用现在完成时，从句用一般过去时。
Mr Green has taught in that school since he came to China three years ago.(还可以用作介词，本句从句还可以用短语：since three years ago(自三年前以来)表示。
)8 till /until都可以作连词，连接时间状语，也可以作介词，与其它词构成介词短语，在句中作状语。
They walked till /until it was dark.Xiao Ming didn’t leave home till / until his father came back.9. by the time 到......为止(所在句子的主句应用现在或过去完成时)By the time he gets there , his father has already gone.By the time I got to school, the class had already began.一 .由when, while, as引导的时间状语从句。
例如：When you think you know nothing, then you begin to know something.当你以为自己一无所知的时候，你就是在开始知道一些事物了。
When truth is buried under the ground it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.当真理被埋在地下的时候，它在生长，它感到压抑，它蓄存着这么一种爆炸性力量，一旦冒出，它就会炸破一切！Strike while the iron is hot. 趁热打铁。
Will you watch my clothes while I have a swim. 我游泳的时候，请你照看一下我的衣服。
You can feel the air moving as your hand pushes through it. 当你的手在空气中挥动的时候，你就能感觉到空气在流动。
Our headmaster laughed as she spoke.我们的校长边谈边笑。
a .when, while和as的区别when引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。
并且when有时表示“就在那时”。
When she came in, I was eating.(瞬时动词)When I lived in the countryside, I used to carry some water for him.（延续性的动词）While引导的从句的谓语动作必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。
并且while有时还可以表示对比。
例如：While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时发生)I like playing football while you like playing basketball.（对比）b, As表示“一边……一边”，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强调“一先一后。
例如：We always sing as we walk.（as表示“一边……一边”）As we was going out, it began to snow.（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）c, as when while的辨析as when while都表示主、从句动作同时发生，三者差异如下：表示“一边。
一边"的意思as 强调两个动作同时进行，并表示对比时用于发生时间较段时d when1、还可以表示从句动词的动作在主几句动词的动作"之前"或"之后"发生。
2、when=and then; at that moment (正在那个时候)3.常用于常见搭配中e while1、用于时间较长时2、强调两个动作同时进行，并表示对比时有时这三个连词可以互换，有时不可以。
lt was raining hard when (as) I got there. ( 动作同时发生，when可换为as, 但不能换为while，因为get是点动词.)When I had read the article, he called me.( 从句动作发生在主句之前，注意时态表达，只能用when )When I got to the cinema, the film had begun.(从句的动作发生在主句之后，只能用when,并要注意时态)He was about to leave, when the telephone rang.( 此时不能放在句首。
