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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。
第十七章状语从句知识点1状语从句的分类知识点2时间状语从句的用法知识点3地点状语从句和条件状语从句的用法知识点4原因状语从句和让步状语从句的用法知识点5比较状语从句和方式状语从句的用法知识点6目的状语从句和结果状语从句的用法知识详单知识点1状语从句的分类知识点2时间状语从句的用法知识点3地点状语从句和条件状语从句的用法知识点4原因状语从句和让步状语从句的用法知识点5比较状语从句和方式状语从句的用法知识点6目的状语从句和结果状语从句的用法考点突破考点1考查时间状语从句的用法1.(龙东中考)-Henry, please call us as soon as you _______ Hawaii.-OK. I'll do that, Mom.A. arrive inB. are arriving inC. will arrive at【解析】选择A as soon as结构意为“一……就……，”引导时间状讲从句，主句为祈使句，从句用一般现在时表示将来。
Hawaii 为大地点.因此用in.考点2考查地点状语从句的用法2.(扬州中考)-My friend has achieved his goal after years of hard work.--- Great.A·One tree can make a forest B. Where there is a will，there is a way C. Many hands make light work D. A friend in need is a friend indeed【解析】选B 第一个人阐述自己的朋友经过多年努力实现目标.，第二个人表示祝贺，同时，发表自己对此事的看法。
应该是“有志者，事竟成”.该句是where引导的地点状语从句。
考点3考查条件状语从句的用法3.(十堰中考)_________ deal with our problems, we can easily become unhappy.A. UntilB. IfC. UnlessD. Though【解析】选C。
初中状语从句知识点总结状语从句是在复合句中充当状语的，用来说明主句中动作或状态发生的情况。
在英语中，状语从句可以分为时间状语从句、地点状语从句、原因状语从句、条件状语从句、结果状语从句等。
本文将对初中阶段学习的状语从句相关知识点进行总结。
一、时间状语从句时间状语从句是用来表示时间的句子。
它们常常在主句之前或之后，通过关系词将两个句子连接在一起。
一些常见的时间状语从句关系词包括when, while, as soon as, before, after, since等。
1. When he was young, he used to play football every day.2. I will call you as soon as I finish my homework.3. The students were practicing the dance while the teacher watched.二、地点状语从句地点状语从句是用来表示地点的句子。
它们常常在主句之前或之后，通过关系词将两个句子连接在一起。
一些常见的地点状语从句关系词包括where, everywhere, wherever等。
1. I will go wherever you go.2. He will stay at home while his parents are traveling abroad.三、原因状语从句原因状语从句是用来表示原因的句子。
它们常常在主句之前或之后，通过关系词将两个句子连接在一起。
一些常见的原因状语从句关系词包括because, since, as, so等。
1. Because it was raining, we canceled the picnic.2. I will not come to your party, since I have to study for the exam.四、条件状语从句条件状语从句是用来表示条件的句子。
初中英语知识点归纳状语从句的分类和用法状语从句是英语语法中重要的一部分，它用来修饰主句的动作或描述情况的，在句子中起着状语的作用。
状语从句分为时间状语从句、条件状语从句、原因状语从句、目的状语从句、结果状语从句、方式状语从句和比较状语从句等。
下面将对初中英语中常见的状语从句分类和用法进行归纳。
一、时间状语从句时间状语从句用来表示动作或事件发生的时间，包括连词when (当...时候)，while (在...时候)，before (在...之前)，after (在...之后)，as (当)，since (自从)，until (直到)等。
时间状语从句一般放在主句之前或者之后。
例如：- When I was young, I used to play soccer with my friends. (当我年轻的时候，我常常和朋友们踢足球。
)- After she finished her homework, she went to bed. (她完成作业之后，去睡觉了。
)二、条件状语从句条件状语从句用来表示主句动作的条件或前提，包括连词if (如果)，unless (除非)，in case (以防)，as long as (只要)，provided/providing (只要)等。
条件状语从句一般放在主句之前。
例如：- If it rains tomorrow, we will stay at home. (如果明天下雨，我们就在家呆着。
)- Unless you work hard, you won't pass the exam. (除非你努力学习，否则你就不能通过考试。
)三、原因状语从句原因状语从句用来表示主句动作或情况的原因，包括连词because (因为)，as (因为)，since (因为)，for (因为)，now that (既然)等。
原因状语从句一般放在主句之前。
例如：- Because it was raining, we stayed at home. (因为下雨，我们呆在家里。
状语从句的复习重点及中考热点状语从句不仅是初中英语学习的重点，而且也是每年中考必考的内容之一。
从笔者研读历年全国各地中考英语试题对状语从句的考查内容来看，命题主要集中在引导状语从句的连词、状语从句的时态等方面；从九大状语从句来看，同学们应将复习重点放在时间状语从句、条件状语从句、结果状语从句和比较状语从句这四种上。
一、对时间状语从句的考查1．要点：1）引导时间状语从句的连词有：while，when，as，as soon as，until，not．．．until，before，after，since，etc．要掌握每个连词的含义及其用法，还有它们之间的一些区别。
2）when，while，as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。
②as和when都可与终止性动词连用，while只能与延续性动词连用。
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；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：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。
3）until和till在肯定句中表示“直到……为止”，主句要用延续性动词；在否定句中，表示“直到……才”，主句常用终止性动词，这时till和until可用before替换。
初中英语知识点归纳：状语从句一时间状语从句1.时间状语从句表示时间，引导词有：when, while, as, till, until before, after, since等。
时间状语从句的引导词所表示的意思不尽相同，要注意把握不同引导词所表示的不同时间关系，以及它在具体句子中对应的时态、语态等问题。
注意：as(在……时候，因为)，since(自从，因为)，它们可以引导时间从句，并强调主句和从句的动作同事发生。
并且while有时还可以表示对比。
例如：(1)While my mother was reading the newspaper, I was watching TV.(read是延续性的动词，read和watch同事发生)I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。
(对比)(2)when(当……的时候)，引导的从句的谓语动词可以是延续性动词，也可以是瞬间动词。
从句动作可与主语动作同事发生，也可在其后发生。
I was reading a book when she came into my room(come是瞬间动词，只能用when引导，不能用while)I often missed my home when(while) I lived in New York.(live是延续性动词，when可用while代替)(3)when和while的区别还在于：while引导的时间状语从句多用于进行时态，而when引导的时间状语从句多用于一般时态。
While they were talking, the bell rang.正在他们谈话的时候，上课铃响了。
(4)as译作“一边……一边”、“随着……”，侧重主句和从句的动作同时发生。
有时可与when，while通用。
We always sing as we walk.我们总是边走边唱。
初中英语状语从句语法及考点归纳(带练习)状语从句状语从句（Adverbial Clauses）状语从句即指在主从复合句用作状语的从句。
按照其意义，状语从句可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句等。
状语从句的位置比较灵活，可以置于句首，也可以置于句末。
1. 时间状语从句(1) when引导的时间状语从句①when引导的时间状语从句，其动词既可以是延续性动作的动词，也可以是瞬间性动作的动词，而且可以表示主句的动作和从句的动作同时发生，或者从句的动作发生在主句的动作之前。
如：when you apply for a job, you must present your credentials.当你申请工作时，你必须递交你的有关证件。
（同时）when the students heard the teacher’s footsteps, they all ｓｔｏｐｐｅｄtalking.当学生们听到老师的脚步声时，他们都停止了讲话。
（从句动作发生在前）② when还可表示just then（正在那时，突然）的意思，此时其所引导的从句只放在主句之后。
如：we were about to start when it began to rain.我们正要动身，突然天下起雨来。
(2) as引导的时间状语从句as引导的时间状语从句其动词的动作是延续性的，而且侧重表示主句和从句的动作并相发生：We were having breakfast as she was combing her hair.她梳头时我们在吃早饭。
(3) while引导的时间状语从句while表示“在某一段时间里”或“在……期间”，其所引导的从句的动作是延续性的，并侧重表示和主句的动作同时发生。
如：I can learn while I work.我可以边工作边学习。
(4) before引导的时间状语从句①before“在……之前”I’ll be back before you have left.你离开之前我就会回来。
初中英语知识点归纳状语从句的用法状语从句是英语语法中常见的一种句子结构，用来修饰动词、形容词、副词等。
归纳总结了初中英语中常见的状语从句的用法，可以帮助初学者更好地理解和运用这一知识点。
一、时间状语从句1. 当状语从句表示将来的动作或情况时，主句使用一般将来时态，从句使用一般现在时态。
例如：I will go to bed after I finish my homework.（在我完成作业之后，我会去睡觉。
）2. 当状语从句表示过去的动作或情况时，主句使用过去时态，从句使用过去完成时态。
例如：He had left before I arrived.（在我到达之前，他已经离开了。
）3. 当状语从句表示现在的动作或情况时，主句使用一般现在时态，从句使用一般现在时态。
例如：I always eat breakfast before I go to school.（在我去学校之前，我总是吃早饭。
）二、地点状语从句1. 当状语从句表示具体位置时，主句使用动词arrive等，从句使用介词+地点名词的结构。
例如：We will meet at the place where we had lunch yesterday.（我们将在我们昨天吃午饭的地方见面。
）2. 当状语从句表示方向时，主句使用动词come/go等，从句使用连词where或标点符号将其与主句分开。
例如：He will go wherever you go.（无论你去哪儿，他都会去。
）三、原因状语从句1. 当状语从句表示结果时，主句使用so，主句中动词通常使用情态动词。
例如：I am ill, so I can't go to school.（我生病了，所以不能去学校。
）2. 当状语从句表示原因时，主句使用because，从句使用一般现在时态。
例如：He didn't eat breakfast because he got up late.（他早上起得晚，所以没有吃早饭。
1状语从句状语从句一．分类：种类连接词注意区别：when/whenever/while/as/before/after/instantly/until/till/by the time/as soon as/hardly when/directly/no sooner than/the moment/the minute/immediately有一些表示时间的名词短语也可用来引导时间状语从句： the minute, the moment, every time, the first time时间例： The moment he reached the country, he started his状语search. 他一到达这个国家，就开始他的探寻工作。
有一些表示时间的副词也可用来引导时间状语从句：directly例： Directly the master came in, everyone was quiet.校长一进来，大家就安静下来地点状语where//wherever as 和 when、while ：as, when 引导短暂性动作的动词。
当从句的动作发生于主句动作之前，只能用 when 引导这个从句，不可用 as 或while 。
从句表示 " 随时间推移 " 连词能用 as，不用when 或 while 。
till/until 和 not till/until：Until 可用于句首，而till 通常不用于句首。
where ，表示某一个；wherever ，表示任何一个。
原因状语Because/as/since/now that/for because 和 since、for 、as、now that ：because 语势最强，用来说明人所不知的原因，回答 why 提出的问题。
当原因是显而易见的或已为人们所知，就用 as 或 since。
由 because 引导的从句如果放在句末，且前面有逗号，则可以用 for 来代替。
状语从句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。
1. 时间状语从句(1)时间状语从句常用when, as（当..时候）, while, before, after, since, till, until, as soon as等连词来引导。
例如：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，主句用将来时态时，从句通常不用将来时态，用现在时态表示将来的动作或状态。
（主将从现）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……”, 谓语动词可用瞬间性动词。
例如：The young man read till the light went out.Let’s wait until the rain stops.We won’t start until Bob comes.Don’t get off until the bus stops.2. 条件状语从句(1)条件状语从句通常由if, unless(除非)引导。
例如：What shall we do if it snows tomorrow?Don’t leave the building unless I tell you to.(2)在条件状语从句里，谓语动词通常用现在时态表示将来的动作或状态。
（主将从现）例如：（必考）I’ll help you with your English if I am free tomorrow.He won’t be late unless he is ill.(3)“祈使句+ and (or)+ 陈述句”在意思上相当于一个带有条件状语从句的复合句。
例如：Hurry up, or you’ll be late.=If you don’t hurry up, you’ll be late.Study hard and you will pass the exam.=If you study hard, you will pass the exam.3. 原因状语从句(1)原因状语从句通常由because, since, as引导。
例如：He didn’t come to school because he was ill.As it is raining, we shall not go the zoo.Since you can’t answer the question, I’ll ask someone else.(2)because表示直接原因，语气最强。
Because引导的原因状语从句多放在主句之后。
As和since语气较弱，一般用来表示明显的原因。
由as和since引导的原因状语从居多放在句首。
例如：------Why aren’t going there?------Because I don’t want to.As he has no car, he can’t get there easily.Since we have no money, we can’t buy it.(3)because和so不能同用在一个句子里。
4. 结果状语从句(1)结果状语从句由so…that, such…that引导。
例如：He is so poor that he can’t buy a bike for his son.She is such a good teacher that everybody likes her.(2)so…that与such...that可以互换（可能会考）。
例如：在由so...that引导的结果状语从句中，so是副词，与形容词连用。
其结构是: “...so + 形容词（副词）+ that + 从句”。
例如：Mother lives so far away that we hardly ever see her.在由such…that引导的结果状语从句中，such是形容词，它修饰的可以是单数或复数可数名词，也可以是不可数名词；名词前面可以带形容词，也可不带。
如果是单数可数名词，前面需加不定冠词a或an。
例如：It was such a hot day that nobody wanted to do anything.有时上述两种结构是可以互换的。
例如：It was such a wonderful film that all of us wanted to see it again.=The film was so wonderful that all of us wanted to see it again.It is such an important match that nobody wants to miss it. =The match is so important that nobody wants to miss it. (3)如果名词前由many, much, little, few等词修饰时，只能用so, 不用such。
例如：Soon there were so many deer that they ate up all the wild roses.He has so little time that he can’t go to the cinema with you.5. 比较状语从句比较状语从句通常由as…as（否定not so/as...as）, 比较级+ than…等连词引导。
例如：Tom runs faster than John does.This classroom is as big as that one.6. 目的状语从句(1)目的状语从句通常由so that, in order that引导。
例如：We started early so that we could catch the first train.He studies hard so that he could work better in the future. We used the computer in order that we might save time.(2)so that既可引导目的状语从句，又可引导结果状语从句。
区别这两种从句的办法有两个：1)目的状语从句里往往带有情态动词can, could, may, might等。
2)从意思上看，目的状语从句往往表示的目的很明确。
例如：Speak clearly so that they may understand you. (目的状语从句) Jack is badly ill so that he has to rest. (结果状语从句)7. 让步状语从句(1)让步状语从句通常由although, though等连词引导。
例如：Though he is young, he knows a lot.Although I am tired, I must go on working.(2)although(though)与but不能用在同一个句子中。
例如：我们不能说：Though it was raining hard, but he still went out. 应该说：Though it was raining hard, he still went out.或It was raining hard, but he still went out.8. 地点状语从句地点状语从句常常由where来引导。
例如：Go where you like.Where there is a will, there is a way.易混引导词while, when的区别：1.when既可以指"时间点",与瞬间动词连用，也可以指"时间段"，与延续性动词连用（=while）。
如：When he came in, his mother was cooking.When (While) we were at school, we went to the library every day.While表示时间段,因此，while 从句的谓语动词要用延续性动词。
如：Please don't talk so loud while others are working. 2．Because,as,since 的区别：Because用于表示直接原因,回答why提出的问题，语气最强；As用于说明原因, 着重点在主句，常译成"由于"；since表示显然的或已知的理由或事实，常译成"既然"。
如：Water is very important because we can't live without it.He didn't come yesterday as his mother was ill.I'll do it for you since you are busy.【实例解析】1.You will stay healthy _______ you do more exercise, such as running and walking.A. ifB. howC. beforeD. where2. ---Shall we go on working?---Yes, _________ I prefer to have a rest.A. whenB. ifC. becauseD. though3.None of us knew what had happened _________ they told us about it.A. whenB. untilC. afterD. though4.---I hope you’ll enjoy your trip, dear!---Thank you, mum. I’ll give you a call _________ I get there.A. untilB. as soon asC. sinceD. till考点精炼一. 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 basket ball with us?---I think he will come if he ______ free tomorrow.A. comes; isB. comes; will beC. will come; isD. will come; willbe3. In the zoo if a child _____ into the water and can’t swim, thedolphins may come 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 hewas young.A. whatB. whichC. whereD. who5. We will stay at home if my aunt ________ to visit us tomorrow.A. comesB. comeC. will comeD. is coming6. 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 somethingwrong with my bike.A. whenB. thatC. untilD. because8. I’ll go swimming with you if I ________ free tomorrow.A. will beB. shall beC. amD. was9. In the exam, the ________ you are, ______ the _______ mistakesyou will make.A. careful; littleB. more careful; fewestC. more careful; fewerD. more careful; less10. You should finish your lessons _______ you go out to paly.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 couldhear 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 heroffice 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真题演练(2010河北省卷42. 1) Peter likes reading a newspaper_________ he is having breakfast.A. untilB. whileC. becauseD. though(2010.江苏省盐城市12. 1)Many students didn't realize the importance of study_____they left school.A.whenB.untilC.asD.after(2010四川省内江市39. 1)I don't know if it______tomorrow.If it______,we won't go on a picnic.A.rains;rainsB.will rain;rainsC.will rain;will rain(2010山东省潍坊市29. 1)You have to leave now________you can catch the early bus.A.so thatB.as soon asC.becauseD.if(2010浙江省衢州市23. 1) You should go over your test paper _____ you hand it in .A. beforeB. thoughC. becauseD. as soon as(2010江苏省无锡市12. 1)Scientists say it may be a few years ______it is possible to test the new medicine on patients.A.becauseB.afterC.beforeD.since(2010年上海市37. 1)We will have no water to drink _______we don't protect the earth.A.untilB.beforeC.thoughD.if（2010江苏省扬州市41）-Could we play football in your playground,Sir?-No,_______you have the principal's permission（校长许可）.A.ifB.unlessC.becauseD.since（2010四川省成都市35. 1）I won't be able to understand what you say,_______you speak too quickly.A.ifB.thoughC.because（2010浙江省湖州市22，1）-Is everyone here today?-No.Tom is at home_____he has got a bad cold.A.becauseB.ifC.untilD.unless（2010山西省27，1）In summer , food goes bad easily ________ it is put in the refrigerator.A. untilB. ifC. unless（2010河南省25，1）________it's difficult to make her dream come true，she never gives upA.ThoughB.UnlessC.BecauseD.If（2010山东省莱芜市27，1）-I hear Jack Chan will come to Laiwu next week.-Really? _______ he comes, my younger sister will be veryhappy,A．If B．Until C．Unless D．Before（2010贵州省铜仁市35，1）- May I go to the concert with you?- I'm afraid not ____ you have a ticket, because I have only one.A. sinceB. ifC. unlessD. though（2010山东省菏泽市27，1）Mary spends a lot of money on clothes _______ her family is not rich.A. becauseB. thoughC. ifD. so（2010黑龙江省鸡西市29，1）Usually, we don't know how important something is ______ we lose it.A. orB. untilC. as soon as（2010广西省定西市15，1）She had a stomachache________she ate something bad.A. soB. becauseC. orD. although(2010福建三明29. 1)Many children like fried chicken _______it is unhealthy food.A.ifB.becauseC.although（2010广西南宁32. 1）Mr.Brown knew nothing about the good news ______his wife told it to him.A.beforeB.afterC.sinceD.if（2010四川达州29. 1）I don't know if Jack________. Ifhe________ , call me, please.A. will come; will comesB. comes; comeC. comes; will comeD. will come; comes（2010天津市41，1）We won't start the meeting ______our teacher arrives.A.thoughB.untilC.whileD.or（2010青海省宁夏33，1）-Did you catch what the teacher said?-No. She spoke so fast _______ I couldn't hear her very clearly.A. whichB. thatC. whenD. since（2010辽宁省沈阳市8，1）____ it snowed heavily yesterday, nobody in our class missed the lesson．A．Though B．Because C．Unless D．Since（2010江苏省镇江市8，1）A tourist will easily lose his way in Beijing _________ he has a map or a guide.A. ifB. becauseC. unlessD. when（2010广东省18，1）The teacher speaks very loudly________all the students can hear her.A. so thatB. becauseC. sinceD. whenKeys: 【练习答案】1.A2.C3.B4.C5.A6.C7.D8.C9.C 10.A 11.B 12.C 13.B 14.A15.C 16.B 17.A 18.D 19.C 20.B真题演练BBBAA CDBCA CAACB BBCAD BBACA。
