专题原因和让步状语从句讲解练习

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英语语法专题原因和让步状语从句(讲解+练习,无答案)

中考语法专题原因和让步状语从句（讲解+练习，无答案）原因和让步状语从句一、原因状语从句用从句来表示主句行为或事件发生的原因，这个从句就是原因状语从句。

常用引导词：because, since, as, for1、because表示人们不知道的直接的原因或理由，着重点在从句；通常用于回答why引出的疑问句，语气最强；除特别强调外，该从句一般位于主句后面；不能与so连用但是可以与so进行同义句转换。

I didn’t go aboard with her because I couldn’t afford it.我没有和她一起出国是因为费用太高。

2、as和since引导的原因状语从句多表示大家众所周知的理由，从句多位于主句之前，since译为“既然”。

如：As I didn’t know the way, I asked a policeman. 我不认识路，因而问警察。

Since traveling by air is much faster, they decided to take a plane. 既然乘飞机旅行快得多，他们就决定坐飞机。

3、for表示的理由是附加的或推断的，并非此原因，通常与主句用逗号隔开，不位于句首，如：He must be not at home, for the telephone isn’t answered.练习（一）用because, as, since, for填空1. We’ll have to go to bed early ________ we’ll start off early tomorrow.2. ________ you know all about it, tell me please.3. ________ all the seats were taken, I had to stand.4. He must be at work, ________ the light in his office is still on.5. Lily didn’t go to school ________ she was ill.二、让步状语从句常用引导词：although, though “尽管虽然”1、两者通常可互换，在口语中，though较为常见。

高中英语状语从句讲解与练习

高中英语状语从句讲解与练习高中英语状语从句一、时间状语从句1、when的用法（1）when既可引导一个持续性动作，也可引导一个短暂性动作，可用于表示主句和从句动作同时发生或从句动作先于主句动作，有时还可表示从句动作后于主句，意为“当……时候”。

（2）when在beabouttodo……when……，bedoing……when……，haddone……when……，beonone’sway……when……，beonthepointofdoing…when……等结构中作“那时突然”讲。

（3）when“既然、鉴于；尽管，虽然（位于主句之后）；如果”2、while的用法（1）则表示“当……时候”，鼓励的动作必须就是延续性的。

（2）用做同列连词，则表示相对关系“然而”。

（3）引导让步状语从句，相当于although,意为“虽然”，位于主句前。

（4）引导条件状语从句，相当于as/solongas，意为“只要”。

3、as的用法（1）则表示“当……时候”，特别强调同时出现，不所指先后。

（2）说明两种正在发展或变化的情况，表示“随着”，表示时间的推移。

（3）表示“一边……一边……”（4）强调两个动作紧接着发生。

（5）表示“虽然，尽管”（6）其他含义“正像，正如”，“做为”，“由于，因为”。

4、before的用法（1）一般意为“在……之前”“……才”，“……就”“还没有……”“免得”“不知不觉”“宁可，宁愿”，“否则，要不然”。

（2）itwillbe/was时间段before通常现在时/通常过去时。

在肯定句中，意为“多长时间之后才”；在否定句中，意为“用没法多长时间就”。

5、until和till（1）与肯定句连用，必须是延续性动词。

（2）与否定句属格，必须不为延续性动词，则表示“直至……才，在……之前不……”。

特别注意：notuntil可以用作特别强调句和倒装句强调句：itis/wasnotuntil…that…倒装句：notuntil放句首时，主句要部分倒装。

初中英语状语从句讲解及典型例题

状语从句在复合句中，用作状语的从句叫状语从句。

状语从句根据它表达的意义可以分为：时间状语从句、地点状语从句、原因状语从句、结果状语从句、让步状语从句、条件状语从句、目的状语从句、比较状语从句、方式状语从句。

（1）时间状语从句引导时间状语从句的连词或短语有：when, while, as, before, after, since, until, as soon as, once, each time, next time等。

1.When引导的时间状语从句When引导时间状语从句时，意为“当....时”，表示主句的动作与从句的动作同时或先后发生。

例：When you are doing your homework, you must be careful.Someone knocked（敲）at the door when I was sleeping.When she first saw the robot, she felt astonished（惊讶）.When Tom got home, he wept with anger.注意：when引导的时间状语从句中的动词可以是延续性的，也可以是非延续性的。

2.while引导的时间状语从句while引导的时间状语从句，意为“与...同时；在...期间”例：They entered the room while we were discussing problems.Father was cleaning the car while I was playing computer games.When she was in college, she felt in love with Mike.注意：while引导的时间状语从句中的动词必须为延续性或者表示状态的动词。

3.as引导的时间状语从句as引导的时间状语从句，表达“正当...，一边...一边...”强调主从句动作同时发生。

状语从句讲解及练习

状语从句讲解及练习初中英语状语从句讲解及专项练习状语从句指由句⼦来作状语。

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“主句+连词+从句”或者“连词+从句，主句”。

⼀、时间状语从句：由when，before，after，as soon as，since，until，not…until引导。

1. Mozart started writing music when he was four years old.当莫扎特4岁的时候，就开始写⾳乐作品。

2. He went home after he finished his homework yesterday.他昨天做完作业之后就回家了。

3. Mr. brown had worked in a bank for a year before he came here.布朗先⽣来这之前在⼀家银⾏⾥⼯作了⼀年。

4. we began to work as soon as we got there.我们⼀到那就开始⼯作。

Mr green has taught in that school since he came to china three years ago.⾃从格林先⽣三年前来到中国就⼀直在这所学校教书。

5. They walked until it was dark.他们⼀直⾛到天⿊。

6. Xia o ming didn’t leave home until his father came back.⼩明直到他爸爸回来才离开家。

⼆、条件状语从句：由连词if, unless (=if not) 引导。

1.I f it doesn’t rain tomorrow, we will go fishing.如果明天不下⾬, 我们就去钓鱼.2.You will get good grades if you study hard.如果你努⼒学习,就会取得好成绩.3.I will go to the party unless he goes there too.我不会去参加聚会的, 除⾮他也去.(如果他不去,我也不去.)4.You will be late unless you leave at once.如果你不马上⾛,你将会迟到的.(=I f you don’t leave at once, you will be late.)(主将从现)：在条件状语从句中, 当主句是将来时的时候,从句要⽤⼀般现在时.三、原因状语从句：由连词because（因为）, since, as（既然，由于）引导1.I didn’t go to school yesterday because i was ill.我昨天没去上学，因为我⽣病了。

根据英语让步状语从句讲解及练习(简化版)

根据英语让步状语从句讲解及练习(简化版)什么是让步状语从句？让步状语从句是英语语法中的一种从句类型，用于表示一种让步关系或相反的情况。

它通常由连词"although"、"though"、"even though"、"while"等引导。

让步状语从句的结构让步状语从句的结构如下所示：- 副词从句：连词 + 主语 + 谓语，例如："Although he is tired,he keeps working."- 倒装形式：连接词 + 助动词/助动词短语 + 主语 + 谓语，例如："Tired as he is, he keeps working."让步状语从句的使用方法让步状语从句用于表达与主句相反或相对的情况。

它可以用于增强论点、表示让步、引出对比等情况。

以下是一些常见的使用方法：1. 表示让步：尽管某种情况存在，但结果仍然是事实。

- "Although he was tired, he went to the party." (尽管他很累，但他还是去了聚会。

)- "Even though it was raining, they went for a walk." (尽管下着雨，他们还是去散步了。

)2. 引出对比：将两种相反的情况进行对比。

- "While some people enjoy winter sports, others prefer indoor activities." (一些人喜欢冬季运动，而另一些人则更喜欢室内活动。

)3. 增强论点：用于在陈述观点时先承认对方的观点，然后提出自己的反驳或结论。

- "Though it may be costly, investing in education is essential for future success." (尽管教育可能很昂贵，但对未来的成功来说是必不可少的。

中考英语语法专题原因和让步状语从句讲解+练习

原因和让步状语从句一、原因状语从句用从句来表示主句行为或事件发生的原因，这个从句就是原因状语从句。

I didn’t go aboard with her because I couldn’t afford it.我没有和她一起出国是因为费用太高。

2、as和since引导的原因状语从句多表示大家众所周知的理由，从句多位于主句之前，since译为“既然”。

如：As I didn’t know the way, I asked a policeman. 我不认识路，因而问警察。

Since traveling by air is much faster, they decided to take a plane. 既然乘飞机旅行快得多，他们就决定坐飞机。

高中英语状语从句用法解析(含练习和答案)

高中英语状语从句用法解析英语语法状语从句类型综述状语从句主要用来修饰主句或主句的谓语。

一般可分为九大类，分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。

尽管种类较多，但由于状语从句与汉语结构和用法相似，所以理解和掌握它并不难。

状语从句的关键是要掌握引导不同状语从句的常用连接词和特殊的连接词即考点。

现分别列举如下:1．时间状语从句常用引导词：when, as, while, as soon as, while, before, after, since , till, until特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … whenI didn’t realize how special my mother was until I became an adult.While John was watching TV, his wife was cooking.The children ran away from the orchard(果园) the moment they saw the guard.No sooner had I arrived home than it began to rain.Every time I listen to your advice, I get into trouble.2．地点状语从句常用引导词：where特殊引导词：wherever, anywhere, everywhereGenerally, air will be heavily polluted where there are factories.Wherever you go, you should work hard.3．原因状语从句常用引导词：because, since, as, since特殊引导词：seeing that, now that, in that, considering that, given that, considering that, inasmuch as, insomuch asMy friends dislike me because I’m handsome and successful.Now that everybody has come, let’s begin our conference.The higher income tax is harmful in that it may discourage people from trying to earn more.Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.4．目的状语从句常用引导词：so that, in order that特殊引导词：lest, in case, for fear that，in the hope that, for the purpose that, to the end thatThe boss asked the secretary to hurry up with the letters so that he could sign them.The teacher raised his voice on purpose that the students in the back could hear more clearly.5．结果状语从句常用引导词：so … that, so… that, such … that,特殊引导词：such that, to the degree that, to the extent that, to such a degree that,He got up so early that he caught the first bus.It’s such a good chance that we must not miss it.To such an degree was he excited that he couldn’t sleep last night.6．条件状语从句常用引导词：if, unless,特殊引导词：as/so long as, only if, providing/provided that, suppose that, in case that, on condition thatWe’ll start our project if the president agrees.You will certainly succeed so long as you keep on trying.Provided that there is no opposition, we shall hold the meeting here.7．让步状语从句常用引导词：though, although, even if, even though特殊引导词：as(用在让步状语从句中必须要倒装)，while ( 一般用在句首)，no matter …，in spite of the fact that, while, whatever, whoever, wherever, whenever, however, whicheverMu ch as I respect him, I can’t agree to his proposal.尽管我很尊敬他，我却不同意他的建议。

高考状语从句讲解和练习题

⾼考状语从句讲解和练习题定义——在复合句中由从句表⽰的状语称作状语从句，状语从句由从属连词引导，也可以由⼀个起连词作⽤的词组引导，有时甚⾄不需要连词⽽直接和主句连接起来。

类型——时间、地点、原因、结果、条件、⽬的、让步、⽅式、⽐较状语从句。

1.引导词when, while, as, as soon as, once, before, after, every time, each time, since, whenever, ever since, until ,till等。

2.whenever, each time, every time的⽤法。

注：whenever=no matter whenevery time / each time 每次，whenever 每当······时，表⽰习惯性、经常性的动作。

Whenever we met with difficulties, they came to help us.Each time he came to town he would visit our school.Eevery time I went to his house, he was out.注：whenever=no matter whenwhenever既可以引导时间从句也可引导名词性从句，no matter when只可以引导时间状语从句。

It does not matter whenever the party begins.3.before的汉英表达1）before的基本含义是“在·····以前”The train had left before he got to the station.注意：与before对应的是after引导的时间状语从句，表“在·····之后”。

状语从句讲解及练习题50题-有答案

状语从句1.在主从复合句中修饰主句中的动词，形容词，副词等的从句叫状语从句。

可分为，时间状语从句，地点状语从句，原因，目的，结果，条件，让步，比较和方式状语从句。

2.时间状语从句起时间状语作用的句子；可放在句首，句中和句尾常用引导词：when，while, as, after, before, since, till, until, the moment, hardly ⋯when , no sooner ⋯than when, while, as 的用法1)when 用法最广，常可代替while 和as, 在while 引导的从句中，动词只能是延续性的When the fire broke out, all the students were sleeping soundly.The telephone rang while I was taking a bath.2)当两个表示时间延续的动作同时发生而又有对比意味的时候，用while ，在这样的复合句中，主句从句的时态通常是相同的。

Father was preparing a report while I was playing PC games.3)常用as 的情况：一边⋯一边；表示随着短暂动作的发生，另一行为伴随发生As he talked on, he got more and more excited.until 和till 的用法表示“一直到⋯”时，主句和从句都用肯定式；I will wait until/ till the concert is over. 表示“直到⋯才⋯”是，主句用否定，从句用肯定式。

They can't go untilSunday.since 的用法since 引导的从句中，如果是持续性动词，往往理解为某一状态的终止。

He has written to me frequently since he was ill. 自从他病好以来，他常写信给我。

2023年中考英语复习+让步状语从句讲解+专练

译林版中考复习让步状语从句讲解+真题练习让步状语从句表示即便出现从句中的情况，主句动作仍然会发生。

引导让步状语从句的常用although /ɔːlˈðəʊ/、though/ðəʊ/、even though和even if。

although /ɔːlˈðəʊ/和though/ðəʊ/,意为“尽管……, 虽然...”，就是我们日常生活中用的“退一步说……”的感觉。

这两个连词意思大致相同，在一般情况下可以互换使用。

在口语中，though较常使用，although比though正式，都可与yet, still或never 连用，但不能与but连用。

although常位于主句前，though位于主句前后均可。

I will try it although I may fail.Though he didn’t have much money, he was still happy.Although /Though it was only eight o’ clock, there were few people in the streets. Although/Though he was tired, (still) he kept on working.even though，意为“即使……”，是以从句的内容为先决条件的，即说话人肯定了从句的事实，表示已经发生了的事。

（一般过去时）Even though it was raining yesterday, we didn’t cancel our meeting.The famers still worked even though it was raining at that moment.even if，意为“哪怕…/就算…”，含有强烈的假定性，可用来表示与事实相反的假设，但不能用来描述已经发生的事实。

(一般将来时)Even if it rains tomorrow, we won’t cancel our meeting.因为含有强烈的假定性，所以有时还可以虚拟语气。

状语从句及练习附答案

状语从句（adverbial clause）复习要点：掌握句法功能，记住连接词语法意义：状语从句是复合句中的一种，整个从句作主句的状语，修饰主句中的谓语动词、形容词、或副词。

置于句首时，状语从句后面一般要有逗号隔开；如果状语从句置于句尾，则从句一般不用逗号。

按照所作的状语和意义可分为时间、地点、原因、目的、结果、条件、让步、方式和比较等九种状语从句。

具体如下：一、时间状语从句（Adverbial Clauses of Time）时间状语从句通常由when,whenever,as,while,before,after,assoon as,since,once,no sooner...then,hardly/scarcely...when,tiLl/until 以及the moment,directly,immediately,the second,thefirst time,next time,every time,等引导。

1.由when,as,while 引导的状语从句：1）when 引导时间状语从句，表示当···，其谓语动词可以是延续性的，也可以是非延续性的，其作用最广泛。

When spring comes,trees turn green,When it rains,I usually go to work by taxi.When we were having lunch,the light went out.I will ring you up when I return.When she pressed the button,the lift stopped.He was eating his breakfast when the doorbell rang.be about to do...when...“就在那/这时，（突然）另一个动作发生了，在这儿只能用when。

初三中考英语状语从句讲解&练习及答案

状语从句状语从句用来修饰主句中的动词，副词和形容词的从句叫状语从句。

根据其含义状语从句可分为时间状语从句，地点状语从句，条件状语从句，原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。

1. 时间状语从句(1)时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。

例如：It was raining hard（rain hard 下大雨）when got to school yesterday.While he was doing his homework, the telephone rang.As he walked along（沿着走）the lake, he sang happily.He had learned a little Chinese before he came to China.After he finished middle school, he went to work in a factory.(2)在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。

例如：I’ll ring you up as soon as I get to New York.I will tell him everything when he comes back.He won’t believe it until he sees it with his own eyes.(3)在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到……时”，谓语动词只能用延续性动词。

如果主句用否定式，其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。

例如：The young man read till the light went out（熄灭）.Let’s wait until the rain stops.We won’t start until Bob comes.Don’t get off（从下来）until the bus stops.【Till是指直到某一特定事件发生的时候，而在那个时刻之后，该事情或状况仍将持续。

高中英语状语从句练习与讲解含答案

高中英语状语从句练习与讲解状语从句状语从句在句中相当于副词做状语,又叫副词性从句。

状语从句分为时间状语从句、条件状语从句、地点状语从句、原因状语从句、目的状语从句、让步状语从句、结果状语从句和比较状语从句。

掌握状语从句应当引导词入手，注意引导词的词义,引导状语从句的引导词都有词思,所以,了解引导词的意思尤为重要。

引导词按意义分为九类:1)时间when , as , while , till , until , before, after , since2)地点where3)原因because , as , since , now that4)条件if , unless , once .so (as)long as . in case5)让步though , whatever (--ever) as, even though, even if6)目的so that, in order that7)结果so ... that8)比较than, as .. as9)方式as , as if例如:1．I fell asleep when ( as , while ) he was doing his exercises .他正作练习时我睡着了。

（时间状语从句）2．When he arrived in Shanghai , his mother met him at the station .他到上海时，他妈妈到车站接他。

（时间状语从句）3．She always sings as she walks .她总是一边走一边唱。

（时间状语从句）4．I waited until he had finished his work .我等到他做完活。

（时间状语从句）5．It was not long before he told me about this affair .不久，他就告诉我这件事。

（时间状语从句）6．He has worked very hard since he entered the factory .自从他进厂，工作一直很努力。

状语从句讲解及习题附答案

状语从句〔一〕状语从句概述〔二〕状语从句详解1. 时间状语从句2.地点状语从句3.条件状语从句4.原因状语从句5.目的状语从句6.结果状语从句7.让步状语从句8. 比拟状语从句9.方式状语从句练习一一. 单项填空1. _______ he’s old, he can still carry this heavy bag.A. ThoughB. SinceC. ForD. So2. ---Do you know if he _______ to play basketball with us"---I think he will e if he ______ free tomorrow.A. es; isB. es; will beC. will e; isD. will e; will be3. In the zoo if a child _____ into the water and can’t swim, the dolphins may e up ______ him.A. will fall; to helpB. falls; to helpC. will fall; helpD. falls; helping4. I don’t remember ________ he worked in that city when he was young.A. whatB. whichC. whereD. who5. We will stay at home if my aunt ________ to visit us tomorrow.A. esB. eC. will eD. is ing6. The police asked the children _______ cross the street ________ the traffic lights turned green.A. not; beforeB. don’t; whenC. not to; untilD. not; after7. I was late for class yesterday _______ there was something wrong with my bike.A. whenB. thatC. untilD. because8. I’ll go swimming with you if I ________ free tomor row.A. will beB. shall beC. amD. was9. In the e*am, the ________ you are, ______ the _______ mistakes you will make.A. careful; littleB. more careful; fewestC. more careful; fewerD. more careful; less10. You should finish your lessons _______ you go out to play.A. beforeB. afterC. whenD. while11. I hurried _____ I wouldn’t be late for class.A. sinceB. so thatC. as ifD. unless12. When you read the book, you’d better make a mark _______ you have any questions.A. whichB. thatC. whereD. though13. The teacher raised his voice _______ all the students could hear him.A. forB. so thatC. becauseD. in order14. He took off his coat _______ he felt hot.A. becauseB. asC. ifD. since15. It is ______ that we’d like to go out for a walk.A. a lovely dayB. too lovely a dayC. so lovely a dayD. such lovely a day16. Mary had ______ much work to do that she stayed at her office all day.A. suchB. soC. tooD. very17. _______ I felt very tired, I tried to finish the work.A. AlthoughB. BecauseC. AsD. As if18. ______ the day went on, the weather got worse.A. WithB. SinceC. WhileD. As19. ______ well you can drive, you must drive carefully.A. So long asB. In order thatC. No matter howD. The moment20. Write to me as soon as you ________ to Beijing.A. will getB. getC. gettingD. got二. 根据中文意思完成以下英语句子1. 不管他跟我开什么玩笑，我都不生气。

状语从句讲解及练习

状语从句状语从句在句中作状语，修饰主句中的动词、形容词或副词等。

状语从句放在主句之前时，常用逗号分开；放在主句之后，一般不用逗号。

状语从句按其意义和作用可分为时间、条件、原因、让步、目的、结果、方式、比较、地点9种。

1．时间状语从句1) 时间状语从句常用连词有when, as, while, before, after, since, till, until, as soon as, hardly … when …, no sooner … than …., the moment等。

2) 时间状语从句一般不用将来时。

因此，主句若为将来时，时间状语从句要用一般现在时。

I’ll go on with the work when I come back tomorrow.3) 连词when, while, as都表示“当……的时候”，但有区别。

as 多用于口语中，强调“同一时间”或“一前一后”，有时还有“随着”的含义。

As he was eating his breakfast, he heard the door bell ring. (强调同一时间)As going out, it began to rain. (强调两个动作紧接着先后发生)As spring warms the good earth, all flowers being to bloom. (as有“随着”的含义)when 强调“特定时间”。

When spring comes, he feels like a trip.When he was eating his breakfast, he heard the door bell ring.while 表示的时间是一段，而不是一点。

while 有时还有对比的含义，意为“然而”。

While he was eating his breakfast, he heard the door bell ring. (强调吃饭的过程)While I was reading, he was playing. (有对比的含义)4) till / until表示“一直到……”时，主句和从句都用肯定式；表示“直到……才……”时，主句用否定式，从句用肯定式。

高考英语语法连词和状语从句专题讲解训练

So clever was he a student that he was able to work out all the difficult problems. 2．除结果状语外，（ too......to ） enough to do , so......as to 等结构同样可以表示结构。如：
You’ d better make a mark at the place where you have any questions.
III 、原因状语从句
1．从属连词有： because， as， since， now that ，seeing that， considering that ，
位置
▲ 注意： No sooner … than, hardly/ scarcely
… when…
主句 ----- 过去完成时，从句 ----一般过去时，
当把 no sooner 和 hardly/ scarcely 提到句首时，应用倒装语序。
I had hardly got home when it began to rain.
II 、地点状语从句
1．引导地点状语从句的从属连词有： where，wherever 指具体地点时，从句可用于主句之前或之后， We should go where the Party needs us most. You are free to go wherever you like.
2．注意区别 where 引导的定语从句与状语从句： You’ d better make a mark where you have any questions.
2．否定句：主句谓语动词必须是非延续性动词，从句肯定式，意为 He won ’ t go to bed till (until) she returns.

状语从句[含练习和答案解析]

第十二讲状语从句（含练习与答案）担任状语的从句叫状语从句，可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。

一、时间状语从句：引导词有after，before，as，once，since，till，until，when，whenever，while，as soon as，the moment/minute…（一…就），the time, the day, every time, next time, each time，by the time ，no sooner…than（一…就），hardly(scarcely)…when（一…就）immediately/directly等．Each/Every time he comes here, he will drop in on me.He was ill last time I saw him.上次我见到他时他病了．Hardly had I got to the office when my wife phoned me to go back home at once.=No sooner had I got to the office than my wife phoned me to go home at once.I recognized him immediately I saw him.※ when, while与 as当主句动作时瞬时的，从句动作是延续的，三者都可以用。

when引导的从句动词可以是延续性的或短暂性的，在“be…when…”句式中when表“at that time(就在这时)”意。

while引导的从句中动词必须是延续性的；有时并不表示时间，而表示对比，意“而”、“却”，并列连词，表对照。

As 强调主、从句动作同时或几乎同时发生，意为“一边…一边…”。

When I got home I found the door locked.While / When / as we were working in the fields, it suddenly began to rain.He was wandering through the streets when a bike hit him.I was about to go out when the telephone rang.I had just arrived at school when my wife phoned me to go home.His pencil is red, while mine is yellow.John sang happily as he went along.※ till与until一般情况下可以互换，但until可以位于句首，till则不能。

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