资源描述
www.ks5u.com【知识要点】 定义：用来充当状语的句子称为状语从句。功能：它主要用于修饰句子中的谓语动词、形容词或副词等，有时修饰整个句子。位置：状语从句的位置较活：可以放在主句之前，用逗号与主句隔开；也可以放在主句之后，一般不用逗号。由于它是从各个方面来修饰、说明谓语动词发生时的各种情况，所以常见的状语从句有九种之多。各种不同的状语从句所使用的关系词也各不相同。 一、时间状语从句引导时间状语从句的从属连词有很多，现将分类用法如下：1.从属连词when，while与as连词用法谓语动词意义例句when从句的动作和主句的动作可以同时发生，也可以先后发生。可以指时间的某个点，也指一段时间。延续性动词非延续性动词当时候When they heard the news，they all jumped with joy.I owed Jack $ 100 when I was in London.as从句的动作与主句的动作同时发生。可以指时间的某个点，也指一段时间。延续性动词非延续性动词随着一边；一边当时候The students sang as they walked.As he stood up，he dropped the glass，breaking it into pieces.while从句的动作与主句的动作同时发生，强调一段时间。从句中常用过去进行时态或一般过去时态。延续性动词当时候在期间While I was reading，he came in.I made some foreign friends while I was in London.注： 1)when还可作并列连词，其意义为“那时，这时”，相当于and at this/that time。常用于下列句式： sb. was doing sth. when.某人正在干某事就在这时sb. was about to/ going to do sth. when.某人正打算干某事就在这时sb. has just done some sth. when.某人刚干了某事就在这时2)when还表示原因“既然”。如：It was foolish of you to take a taxi when you could easily walk here in five minutes.既然你可以步行五分钟就能到这儿，坐出租车来真是愚蠢。3)while作为并列连词，意为“而，却”，表示对比。He likes pop music，while I am fond of folk music.他喜欢流行音乐，而我却喜欢民间音乐。4)如果主句表示的是短暂动作，而从句用延续性动词的进行时态表示在一段时间内正在进行的动作时，when，while与as可互换使用。如：When/While/As I was walking down the street，I came across an old friend of mine.我在街道上走的时候，见到了我的一个老朋友。2.从属连词：as soon as，immediately，directly，the moment，the minute，no sooner.than.,hardly/scarcely. when.，once这些从属连词引导的从句都表示从句的动作一发生，主句的动作随即就发生，意为“一就”。从句中用一般时态代替将来时态。如：Once you remember it，youll never forget it.一旦你记住它，就永远不会忘记。The moment I heard the voice，I knew father was coming.我一听到声音，就知道是父亲来了。No sooner had we arrived at the station than the train left.我们一到达车站，车就开了。注：no sooner.than.; hardly/scarcely.when.这一结构的时态搭配：no sooner与hardly/scarcely引导的主句谓语动词应用过去完成时，而than与when的从句中谓语应用一般过去时。此外，当把no sooner和hardly/scarcely提到句首时，应用倒装语序。我一到家，天就开始下雨了。I had hardly got home when it began to rain.Hardly had I got home when it began to rain.3.till，until (not.until/till.直到才)连词用法动词意义例句till/until主语和从句都用肯定式主句的动词为连续性动词一直到为止Ill stay here till/until the rain stops.not.till/until主句用否定形式，从句用肯定形式主句的动词为非连续性动词直到才He didnt go home till/until he finished his homework.注：1) till不可以置于句首，而until可以置于句首。如：Until you told me I had no idea of it.直到你告诉我，我对此事才有所了解。2)如果将“not until.”结构放在句首，那么主句要写成倒装句。如：Not until we pointed out their fault to them did they realize it.直到我们向他们指出了他们的错误，他们才意识到。4.every time，each time，next time等名词短语用来引导时间状语从句，表示“每当，每次，下次”。如：Every/Each time I was in trouble，he would come to help me out.每次我遇到麻烦，他总会来帮我。Next time you come，do remember to bring your son here.下次你来的时候，一定要记得把你儿子带来。5.从属连词：before(在之前)，after(在之后)，since(自从以来)。如：Please remember to turn off all the lights before you leave the classroom.离开教室前，请记得把所有的灯都关上。注：1)上述三个连词，既是从属连词，也是介词。2)若表达“还未就”“不到就”“才”“趁，还没来得及”时，需用连词before。如：We had sailed four days and four nights before we saw land.我们航行了四天四夜才看到陆地。We hadnt run a mile before he felt tired.我们跑了还不到一英里他就累了。Please write it down before you forget it.趁你现在没忘把它记下来。二、地点状语从句1.常用的引导词有where（在地方）,wherever（无论在什么地方）等。指具体地点时，从句可用于主句之前或之后，表示抽象条件时，从句须放在主句之前。如：The university graduates are determined to go wherever they are needed most.那些大学毕业生们决心去最需要他们的地方。They are planting trees where there is plenty of water and sunlight.他们在阳光雨水充分的地方植树。Where there is a will, there is a way.有志者事竟成。2.注意区分where引导的定语从句与状语从句。你最好在有问题的地方作个标记。Youd better make a mark where you have any questions.(状语从句)Youd better make a mark at the place where you have any questions.(定语从句)三、条件状语从句1.常用的引导词有if（如果，假如）,unless（除非，要不就不）,as long as（只要）,so long as（只要）,provided (that）（只要），suppose/supposing（假设），on condition (that）（如果）等。如：I may not come to see you recently unless I can complete the project ahead of time.除非我能提前完成那个项目，否则我最近不会来看你了。We can surely attain our goal as long as we are united as one.只要我们团结一致，我们肯定能实现我们的目标。What shall we do if we can not get the necessary data？如果我们弄不到必要的数据，我们怎么办？They promised to let us have a meeting in their office on condition(that）we could keep it clean.如果我们能保持清洁，他们答应让我们在他们的办公室里开会。2.要点提示：1)在表示条件的状语从句中，既可以用直陈语气作“真实条件句”，也可以用虚拟语气作“非真实条件句”。至于把句子作成哪一种条件句，要依照“有关语法规则”和“表达意思的需要”而定。 2)用unless引导条件状语从句时，要注意这个连词自身在意义上是否定的：unless=if.not.。因此，我们在逻辑上要注意：英文句子的用法和中文句子的译文。特别是当主句是否定句时，逻辑上的意思就成了“否定之否定而表示肯定”的情况了。如：I will not go to their party unless I am invited.这个句子的实际意义等于：I will not go to their party if I am not invited.这就是说，“我不去参加聚会”的条件是“我没有受到邀请”。“不去”与“没有受到邀请”就构成了“否定之否定而表示肯定”的情况了。）假如他们不邀请我，我不会去参加他们的聚会。He will finish the work in time unless something unexpected happens.这个句子的实际意义等于：He will finish the work in time if something unexpected does not happen.假如没有什么意外的事情发生，他会按时完成他的工作的。3)suppose/supposing这两个词所表达的意义和句法功能是一样的。它们与其他的引导状语从句的从属连词一样，引导一个含状语从句的主从复合句。而它们的特别之处在于：有时由它们所引出的条件状语从句常与主句分开而独立成句，但其意义和作用还是条件状语从句。这种情况多数出现在科技文章及某些论文里。如：Suppose no more rain fell into the Atlantic Ocean and no more water was brought to it by rivers.It would take the ocean about 4000 years to dry up.假如不再有雨水注入大西洋，不再有河水流入大西洋的话；大约需要四千年的时间大西洋才会枯竭。Suppose your statement is right.How are you going to prove it? 假定为你的观点是正确的，你打算如何证明这一点呢？Suppose this poor girl is yours. Wed like to know how much you know about her.假设这个可怜的女孩就是你的；我们想了解你知道多少关于她的情况。四、原因状语从句1.常用的引导词有because因为,as由于,since既然，由于,now that既然，由于,not that.but that不是因为而是因为，seeing that，considering that等。如：He cant deliver his lectures today because he has got a bad cold.他今天不能去讲课了，因为他患了重感冒。I may not be able to attend your wedding party not because Im not willing to but because Ive been caught by something recently.我或许无法参加你的婚礼了，不是我不想去而是近来有些事情缠着我无法脱身。2.要点提示：1) 从属连词用法区别区别项目位置内涵语气能否回答why能否被强调because因为主句前或后直接因果关系强能能as由于主句前或后since/now that 既然主句前双方都知道的原因弱不能不能主句前if/when主句前或后2)关于since和now that这两个词在表示原因的时候是近义词，都表示“既然”。但其不同之处在于：now that只能以“新发生的情况”作为某事发生的原因；而since在表示“既然”时,就没有这种限制。如：Now that the rain is going to stop, wed better get ready for the afternoons match. 既然雨要停了，我们最好为下午的比赛作好准备。（此句中，now that引出的从句显然是表示“新出现的情况”，在句子中作“主句动作发生的原因”。也就是说，只有在这种情况下才可以用now that引导从句，表示“既然”。）Since youre so interested in English, why not have a try in the English Speech Contest?既然你对英语这么有兴趣，为什么不试一试参加英语演讲比赛？3）其他表示原因的方式除了状语从句外，一些介词短语同样可以表示原因，这样的短语有because of; thanks to; due to; owing to等。五、让步状语从句引导让步状语从句的从属连词有though（虽然）,although（虽然），even if（即使）,even though（即使）,as(尽管)，while(虽然),whether.or.(无论还是),no matter+疑问词（无论）。1.though或although引导让状语从句。although与though两者意思相同，一般可互换，都可以与yet，still或nevertheless连用，但不能和but连用。如：He is unhappy though/although he has a lot of money.虽然他有许多钱，但他并不幸福。Although/Though it was raining hard，yet they went on playing football. 尽管雨下的很大，但他们仍在继续踢足球。注：though还可用作副词，意为“可是，然而”，置于句末。如：He said he would come；he didnt though.他说他会来，可是他没有来。2.当as作“尽管，虽然”的意思讲引导让步状语从句时，从句往往放在主句的前面，而且用作让步的部分（表语、状语或动词原形）总是提前到句首。若表语是名词，前置时要省略冠词。如：Child as he is，he knows a lot.尽管他是孩子，他却懂得很多。Old as he is, he is still energetic.尽管他老了，却依然精力充沛。（表语作为让步的内容，因此提前了。）Try as he might , he couldnt solve the problem.尽管他很努力了，但还是无法解决这个问题。(谓语提前了）Much as you suspected him, you couldnt provide powerful evidence.虽然你非常怀疑他，但是你却无法提供有力的证据。（状语作为让步的内容，因此提前了。）3.whether.or（不管） 疑问词+ ever与no matter+疑问词（不管，无论）。however（不管怎样）,whatever（无论什么）,whoever（无论谁）。no matter when(how, what, who, where, which）无论何时（怎样，什么，谁，何地，哪个）等。如：Air exists everywhere although we cant see it.尽管我们看不见空气，但它却无处不存在。No matter where you go on the earth, you will feel the gravity.无论你走到地球的什么地方，你都会感觉到地引力。Well start our meeting on time whether he comes or not.无论他来不来，我们将准时开会。Even if we are approaching the end of the experiment, we still have no time to lose.即使我们即将完成试验，我们依然要分秒必争。注：whoever，whatever，whomever，whichever还可以引导名词性从句。如：You can take whatever you like.你可以拿任何你所喜欢的东西。六、方式状语从句常用的引导词有as（如同，按照）,as if（似乎，仿佛）,as though（似乎，仿佛）等。如：He speaks English almost as a native speaker does.他的英文几乎说得如讲英语母语的人一样。He speaks English as if he were a native speaker.他讲英文的样子似乎像说英语母语的人。She looked unwell as though she got a bad cold.她看上去身体不适好像患有重感冒。In this reading room you can read anything as everyone does here.在这间阅览室里，你可以像这儿的每个人一样想看什么就看什么。要点提示：as if或as though引导的方式状语从句中，如果表示真实情况应该用直陈语气；如果表示非真实情况则应该用虚拟语气。关于这一点也取决于说话人的态度、看法。如：It gets darker and darker in the sky as if its going to rain.天越来越暗了似乎要下雨了。（表示真实情况，是直陈语气）She speaks as if she knew everything in the world.她说话的样子仿佛似她懂得天下事。（表示非真实情况，是虚拟语气）七、目的状语从句常用的引导词有so that（以便，为了）,in order that（为了）,lest（以免，以防）,in case（以免，以防）,for fear（以免，以防）等。如：We should do our utmost in order that we may be able to over fulfill the task.为了超额完成任务，我们应该全力以赴。Youd better leave your phone number, so that I can call you before I come next time.你最好将电话号码留给我，以便我下次来之前可以先给你打个电话。Batteries must be kept in dry places for fear that electricity leaks away.电池应该放在干燥的地方，以免漏电。要点提示：在目的状语从句中，我们可以将这些引导目的状语从句的连词so that, in order that，lest, in case, for fear分作为两大部分：表示肯定so that, in order that是“为了使发生(目的是，为的是)”。表示否定lest, in case, for fear是“为了使不发生（以免，以防）”。另外，在表示否定的目的状语从句中，谓语动词往往用“should+动词原形”或“动词原形”两种虚拟句式。如：He took his umbrella with him lest it should rain.他带了雨伞，以防下雨。Ill keep a seat for you in case you should change your mind.我给你留个座，没准你会改变主意。八、结果状语从句1.常用的引导词有that（结果，以至），so that（结果，以至），so.that（如此以至）,such.that（如此以至）等。如：The temperature is increased so that the volume of gas becomes greater.温度升高了气体的体积就增大了。The mountain is so high that she cant climb it up to the top.那座山太高了，她无法登上山顶。It is such a lovely day that everybody feels happy and gay.天气这么好，人人都感到高兴、快乐。注：1)so.that和such.that都是引导结果状语从句的从属连词，它们都表示“如此以至”，但其要求的句型结构不一样。如：He ran so fast that his brother couldnt catch up with him.他跑得太快了，他弟弟赶不上他。He is such a naughty boy that he becomes unwelcome in his neighborhood.他是那么个调皮的孩子，以至在邻里中不受欢迎。She looks so lovely that everybody cant help taking a look at her when passing her by.她生得太可爱了，从她身边经过的人都忍不住要看她一眼。2)当so或such置于句首时，主句要用倒装语序。如：So clever was he that he was able to work out all the difficult problems. 他是如此聪明以至于他能解出所有的难题。2.除结果状语从句外，too.to.(太而不能)，enough to.(能够)，so.as to.(那么以至于)等不定式结构同样可以表示结果。如：他起床晚了，结果误了车。He didnt get up early enough to catch the bus.=He got up too late to catch the bus.=He got up so late as to miss the bus.九、比较状语从句常用的引导词有than（比）,as.as（如一样）,“the +比较级.,the+比较级.”（越越）等。如：He is taller than his brother.他比他弟弟个高一些。The more they discover about the brain, the more questions they cant answer in that area.他们越多地发现有关人脑的情况，他们就有越多的问题无法回答。要点提示：有关比较状语的问题请看前面“形容词与副词的比较级和最高级”一章。这里只提醒一个关于比较状语从句的问题。那就是：than和as.as中的第二个as都是连词，后面若是人称代词，常用主格形式。如：Her mother is not as tall as she（is）.她妈妈没有她个高。I dont think that he is taller than I.我并不认为他比我个高。十、状语从句中的省略1.若从句中的主语与主句的主语一致，同时从句中又含有系动词be，则通常省去从句的主语和系动词be而保留其余部分。如：While (she was) very young，she began to study English.她很小的时候就开始学英语。2.若从句主语是it，动词是系动词be,则通常省去主语it及系动词be而保留其余部分。如：Everything went on better than (it had been) expected.一切进展得比预料的要好。3.若从句中部分内容与主句中的部分内容相同，可将从句中的此部分内容省略。如：She has no money. If (she has) any，she will give us. 她没钱，如果有的话，她会给我们的。【考点诠释】考点1 状语从句的时态高考主要考查时间、条件、让步状语从句用一般现在时表将来及一般过去时代替过去将来时的用法。如：He said he would go to Japan for holiday when he finished writing the book他说他写完这本书后会去日本度假。Even if it snows tomorrow，the performance wont be called off即使明天下雪，演出也不会取消。考点二 状语从句的结构高考主要考查结构较为复杂、特殊的状语从句，如no matter+疑问词；whatever，however，as引导的让步状语从句；“the+比较级，the+比较级”中的比较状语从句等。如：The harder you work，the better your studies will be你学习越努力，功课就越好。No matter what serious difficulties he met with，he could always overcome them不管碰到多么可怕的困难，他总能克服。考点3 状语从句的省略在时间、原因、条件、方式、让步等状语从句中，常常省略相同的主语或作主语的代词it以及be动词，保留现在分词、过去分词、介词短语、不定式等成分。如果从句中有“it is+形容词”，也可以省略it is。如：Once printed，this dictionary will be very popular一旦出版，这本词典会非常畅销。(once后省去了it is)Do not leave the building until instructed to do SO接到指示后才可离开这幢房子。(until后省去了you are)考点4 从属连词的选择和辨析高考重点考查引导状语从句的从属连词，如引导时间状语从句的immediately，the moment，every time，once；引导条件状语从句的as long as；引导原因状语从句的now that，since；引导让步状语从句的even if，even though；引导目的状语从句的in case，in order that等。如：We hadnt met for 20 years，but I recognized him the moment I saw him我们已经有20年没见面了，可是我一见到他就认出他来了。(时间状语从句)We should bring a knife in case that there ale any dangerous animals there我们应当带把刀，以防那儿有什么危险动物。(目的状语从句)考点5 where引导地点状语从句要注意where引导的地点状语从句和where引导的定语从句、表语从句以及宾语从句的区别。如：The flower grows best where it often rains这种花在经常下雨的地方长得最好。(地点状语从句)The flower grows best in the place where it often rains这种花在经常下雨的地方长得最好。(定语从句)典题链接【示例1】It is almost five years _ we saw each other last time.A. beforeB. sinceC. afterD. when解析:此题考查时间状语从句的用法。这是一个典型的句型结构：It is/has been+段时间+since+句子(一般过去时)。句子意思是：自从我们上次见面几乎有五年了。答案：B【示例2】There were dirty marks on her trousers _ she had wiped her hands.A. whereB. whichC. whenD. that解析:根据句子结构，由于从句结构完整，可排除B、D两项；前面的先行词是on her trousers表地点，where在此引导状语从句，where相当于in the places where，本句意思是：在她裤子上擦手的地方有脏迹。答案：A特别提示：学会将where引导的状语从句转换成介词短语(地点)+where引导的定语从句是逐步掌握这种用法的好办法。【示例3】We were told we should follow the main road _ we reached the central railway station.A. wheneverB. untilC. whileD. wherever解析:根据两句子的关系不存在让步，从而可排除选项A、D；再根据句意，表示until前面的动作或者状态一直持续到until后面的地点或时间。答案选B。本句意为：有人告诉我们应沿大路走，一直走到中心车站。答案：B【示例4】You can eat food free in my restaurant _ you like. A. wheneverB. whereverC. whateverD. however解析:主句部分不缺主、宾、宾补成分，也有具体的地点状语，故选A。本句意为：无论任何时候你都能在我饭店里免费吃饭。答案：A【示例5】We were swimming in the lake _ suddenly the storm started.A. whenB. whileC. untilD. before解析:when表示这时突然,相当于suddenly。其常用结构有were/was doing.when.；were/was about to do.when.；had/had not done.when.。答案：A【示例6】You should try to get a good nights sleep _ much work you have to do. A. howeverB. no matterC. althoughD. whatever解析:根据句子结构，排除选项B、C，因B项后面需连接副词when，how，where或连接代词who，what，而C项后面的句子不能倒装；当名词前有much，many，little，few等修饰时，前面不能用whatever，故选A。答案：A【示例7】Id like to arrive 20 minutes early _ I can have time for a cup of tea. A. as soon asB. as a resultC. in caseD. so that解析:此题考查目的状语从句的用法。as soon as“一就”， as a result “结果是”，in case“万一”，so that“以便于”。答案：D【示例8】Scientists say it may be five or six years _ it is possible to test this medicine on human patients.A. sinceB. afterC. beforeD. when解析:根据句子的意思，科学家对药品先要进行反复试验后才能用于病人身上，因此答案选C。本题考查了before的固定句型，即It was/will be+时间段+before+主+谓(did/do)。答案：C特别提示：要选对连词，一定要清楚主从句之间的语意和逻辑关系。思维升级怎样做好状语从句试题呢？首先我们应该系统地掌握状语从句的基本知识，把握每个连词的具体用法；其次我们要正确区分容易混淆的连词，像as, when, while, since, even if ,as if等；再者，要善于理清句子的逻辑关系，要具备分析长难句的能力。要特别注意as引导让步状语从句、时间状语从句、方式状语从句和原因状语从句的不同用法。例如：As time went on, Einsteins theory proved to be correct.(时间)As(=Since) the weather is fine, lets go.（原因）Do as you like.（方式）Child as/though he is, he knows a lot.（让步）思维链接【示例】_ I explained on the phone, your request will be considered at the next meeting.A. WhenB. AfterC. AsD. Since解析:此题考查as引导定语从句和状语从句的区别。此题中as引导的是非限制性定语从句，as指代后面整句话的内容，意为“正如”。句子意思是：正如我在电话里所解释的，你的要求会在下次会议上考虑。A和B两项都指时间，D项表示“既然”，指原因，都引导状语从句。答案：C特别提示：since既可以引导时间状语从句，表示“自从开始”，也可以引导原因状语从句，表示“因为、既然”。Its/It has been 10 years since he enjoyed a good dinner.Since you have finished your work, you are free to do what you like. 状语从句考点典型陷阱题分析1. “May I go and play with Dick this afternoon, Mum?” “No, you cant go out _ your work is being done.”A. beforeB. untilC. asD. the moment【陷阱】容易误选B，误认为这是考查 notuntil结构。【分析】最佳答案选 C。句中的 your work is being done 表明“你正在做作业”，选 as 表原因。2. “Im going to the post office.” “_ youre there, can you get me some stamps?”A. AsB. WhileC. BecauseD. If【陷阱】容易误选A。【分析】最佳答案选 B。尽管 as 和 while 均可用作从属连词引导时间状语从句，表示“当的时候”，但两者有一个重要区别，就是这样用的 as 从句的谓语不能是状态动词。当然，如果 as 不是表示“当的时候”，其谓语是完全可以用状态动词的。如：I went to bed early, as I was exhausted. 我很累了，所以很早就上床睡了。(此句中的 as 表示原因，意为“因为”、“由于”)请做以下两题，答案均选 while，不选as：(1) _ you are at home alone, please dont leave the door open. A. WhileB. AsC. BeforeD. How(2) _ you are alone with her, tell her that you like her. A. WhileB. AsC. AfterD. How3. After the war, a new school building was put up _ there had once been a theatre. A. thatB. whenC. whichD. where【陷阱】几个干扰项均有可能误选。【分析】最佳答案选 D。where 在此引导地点状语从句，其意为“(在)的地方”。请做以下类似试题(答案均选 where)：(1) The famous scientist grew up _ he was born and in 1930 he came to Shanghai.A. whenB. wheneverC. whereD. wherever(2) She found her calculator _ she lost it. A. whereB. whileC. in whichD. that(3) You should make it a rule to leave things _ you can find them again. A. whenB. whereC. thenD. which(4) When you read the book, youd better make a mark _ you have any questions.A. at whichB. at whereC. the place whereD. where(5) You should let your children play _ you can see them.A. whereB. whenC. in whichD. that(6) Now he works in the factory _ his father used to work.A. whereB. whenC. in whichD. that4. The visitor asked to have his picture taken _ stood the famous tower.A. thatB. at whichC. whenD. where【陷阱】几个干扰项均有可能误选。【分析】最佳答案选 D。此题与上面一题有些相似，但又有所不同：相似的是，where 均表示“在的地方”，均用以引导地点状语从句；不同的是，此题还涉及倒装，即此句的主语是 the famous tower，谓语是 stood，正常词序为 where the famous tower stood，使用倒装是为了保持句子平衡，避免头重脚轻。5. They kept trying _ they must have known it was hopeless.A. ifB. becauseC. whenD. where【陷阱】几个干扰项均有可能误选。【分析】最佳答案选 C。when 在此的意思不是“当的时候”，而是“尽管”、“虽然”的意思。又如：He walks when he might take a taxi. 尽管他可以坐出租车，但他却走路。He stopped trying when he might have succeeded next time. 尽管他本来下次就可以成功的了，但他却停止努力了。The boy was restless when he should have listened to the teacher carefully. 这男孩子本来应该专心听老师讲的，但他却坐立不安。有许多同学只知道 when 表示“当的时候”，而不知道它还有其他许多意思，除上面提到的表示“尽管”、“虽然”外，when 还可表示“既然”、“考虑到”。请做下面的试题(答案选D)：Why do you want a new job _ youve got such a good one already?A. thatB. whereC. whichD. when6. He was about to tell me the secret _ someone patted him on the shoulder.A. asB. untilC. whenD. while 【陷阱】几个干扰项均有可能误选。【分析】最佳答案选 C。when 意为“这时(突然)”，主要用于某一动作突然发生于另一动作正在进行或刚要发生之时。此时的 when 可以连用副词 suddenly，也可以不连用它，但值得注意的是，同学们不能单独用 suddenly 来代替 when，如下面各题的答案选A，不选B：(1) I was about to go out _ the telephone rang. A. whenB. suddenly C. as soon asD. directly(2) We were swimming in the lake _ the storm started. A. whenB. suddenlyC. untilD. before(3) She was walking down the road _ she heard someone shouting for help.A. whenB. suddenlyC. untilD. before7. The fire went on for quite some time _ it was brought under control.A. whenB. sinceC. afterD. before 【陷阱】几个干扰项均有可能误选。【分析】最佳答案选 D。before 意为“在之前”，句意是“大火在得到控制之前燃烧了相当一段时间”。类似地，以下两题也选 before：(1) He made a mistake, but then he corrected the situation _ it got worse.A. untilB. whenC. beforeD. as(2) Someone called me up in the middle of the night, but they hung up _ I could answer the phone.A. asB. sinceC. untilD. before(3) She is getting better by degrees, but it will be some time _ she is completely well.A. thatB. sinceC. whenD. before(4) They sat down opposite each other, but it was some moments _ they spoke. A. afterB. beforeC. sinceD. when 8. Mother asked me to take more money _ something unexpected should happen.A. in caseB. so thatC. in order thatD. when【陷阱】几个干扰项均有可能误选。【分析】最佳答案选 A。in case 起连词作用，用以引导状语从句，主要有两种意思：一是表示条件，意为“如果”、“万一”；二是表示“目的”，意为“以防”、“免得”。如以下各题也都选 in
展开阅读全文