1、高中英语语法状语从句精讲高中英语语法状语从句精讲状语从句(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。定义在句子中充当除谓语以外的各种句子成分的动词形式叫做非谓语动词(the Non-Finite Verbs。非谓语动词也是动词的一种,他们有着动词的其他特点,可以充当主语、宾语、状语等。非谓语动词与谓语动词是相对的概念
2、。状语从句的种类1.时间状语从句2.地点状语从句3.原因状语从句4.条件状语从句5.目的状语从句6.让步状语从句7.比较状语从句8.方式状语从句9.结果状语从句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.我到北京就将给你打电话。(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 fini
3、shed 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 finishedIf he comes back,please let me know.如果他回来了,请通知我。(从句中的谓语动词用comes back,表示一般将来时,决不可用will come back状语从句讲解和练习状语修饰动词、形容词、副词或整个句子。通常由副词、介词短语、动词不定式、分词和从句等担当。例如:1.Naturally,our grandparents were pleased to ge
4、t our phone call.(副词2.We worked hard,from sunrise to sunse t.(介词状短语3.To help my disabled aunt,I spend an hour working in her house every day.(不定式4.Seen from a distance,the farmhouse looked deserted.(过去分词5.I know how to light a camp fire because I had done it before.(原因状语从句状语的位置比较灵活,可以位于句首、句末或句中。enou
5、gh用作状语修饰形容词和副词时必须后置。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,before,after,since,till,until特殊引导词:the minute,the moment,the second,every time,the day,the instant,im
6、mediately,directly,no soonerthan,hardlywhen,scarcelywhenI didnt 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,then it began to rain.Every t
7、ime 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.地点状语从句一般由连接副词where,wherever等引导,已经形成了固定的句型,例如:句型1:Where+地点从句,(there+主句。【注意】此句型通常译成“哪里哪里就”;主句在从句后面时,
8、there可用可不用;如果主句在从句的前面时,一般都不用there。例如:Where there is no rain,farming is difficult or impossible.在没有雨水的地方,耕作是困难的,或根本不可能的。They were good persons.Where they went,there they were warmly welcomed.他们都是好人。因此他们走到哪里都受到热烈欢迎。You should have put the book where you found it.你本来应该把书放回原来的地方。Where the Communist Part
9、y of China goes,there the people are liberated.哪里有了中国共产党,哪里人民就得解放。句型2:Anywhere/wherever+地点从句,+主句。【注意】anywhere本身是个副词,但是,常可以引导从句,相当于连词,意思相似于wherever,anywhere引导的从句可位于主句之前,也可以位于主句之后。而wherever本身就是个连词,表示“在何处,无论何处”。例如:Wherever the sea is,you will find seamen.有海就有海员。3.原因状语从句常用引导词:because,since,as,for特殊引导词:s
10、eeing that,now that,in that,considering that,given that.My friends dislike me because Im handsome and successful.Now that everybody has come,lets begin our conference.The higher income tax is harmful in that it may discourage people from trying t o earn more.4.目的状语从句常用引导词:so that,in order that特殊引导词:
11、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:sothat,suchthat,特殊引导词:such
12、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.Its such a good chance that we must not miss it.To such a degree was he excited that he couldnt sleep last night.倒装句。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
13、 that,supposing that,in case that,on condition thatWell 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.如果没有反对,我们将在这举行会议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
14、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,whicheverMuch as I respect him,I cant agree to his proposal.尽管我很尊敬他,我却不同意他的建议。The old man always enjoys swimming even though the weather is rough.No matter how hard he tried,she could not ch
15、ange her mind.He wont listen whatever you may say.8.比较状语从句常用引导词:as(同级比较,than(不同程度的比较特殊引导词:the morethe more;just as,so;A to B is what/as X is to Y;nomore than;not A so much as BShe is as bad-tempered as her mother.The house is three times as big as ours.The more you exercise,the healthier you will be
16、.Food to men is what oil is to machine.食物之于人,犹如油之于机器。9.方式状语从句常用引导词:as,as if,how特殊引导词:the wayWhen in Rome,do as the Roman do.She behaved as if she were the boss.虚拟从句Sometimes we teach our children the way our parents have taught us.10.状语从句的简化状语从句的省略状语从句同时具备下列两个条件:主句和从句的主语一致,或从句主语为it;从句主要动词是be的某种形式。从句
17、中的主语和be动词常可省略。例如:When(the museum is completed,the museum will be open to the public next year.Hell go to the seaside for his holiday if(it is possible.另外,比较状语从句经常省略。例如:Im taller than he(is tall.The higher the temperature(is,the greater the pressure(is.温度越高,压力越大。就状语从句而言,有时为了使语言言简意赅,常常将状语从句进行简化。状语从句的简
18、化现象在口语中较为普遍,而且在高考中的复现率也较高。因此,有必要对其进行全面、透彻的了解。状语从句的简化现象常存在于以下五种状语从句中:由if,unless等引导的条件状语从句;由although,though,even if/though等引导的让步状语从句;由when,while,as,before,after,until/till等引导的时间状语从句;由as,as if等引导的方式状语从句;由as,than等引导的比较状语从句。下面针对这五种情形作一归纳。(1当状语从句的主语是it,且谓语动词是be时,it和be要完全简化掉。例如:If(it is possible,he will he
19、lp you out of the difficulty.如果可能的话,他会帮你摆脱困境。条件You must attend the meeting unless(it is inconvenient to you.除非情况对你来说不方便,否则你必须出席这次会议。条件(2当状语从句的主语和主句的主语一致时,从句可以将主语和be动词简化掉。常用于以下几种情形:a.连词+形容词As(he was young,he learned how to ride a bike.他小时候就学会了骑自行车。Whenever(she is free,she often goes shopping.她有空就去逛商店
20、。Work hard when(you are young,or youll regret.少壮不努力,老大徒伤悲。b.连词+名词While(he was a young boy,he was always ready to help others.他在孩子时代就乐于助人。Although(he was a farmer,now he is a famous director.尽管他曾是个农民,而现在是位著名的导演了。c.连词+现在分词As(she was walking along the river bank,she was singing a pop song.她沿着河堤边走边唱着流行歌
21、曲。Although(he is doing his best in maths these days,he has still got no good marks.尽管近来他一直在学数学,但他仍然没有取得好成绩。d.连词+过去分词He wont go there with us unless(he is invited.除非受到邀请,否则他不会和我们一道去那里。The concert was a great success than(it was expected.这场音乐会出乎意料地取得了巨大成功。e.连词+不定式He stood up as if(he were to say somet
22、hing.当时他站起来好像要说什么。He wouldnt solve the problem even if(he were to take charge.即使他来负责,他也解决不了这个问题。f.连词+介词短语She looked anxious as though(she was in trouble.她看上去很焦急,好像遇到了麻烦。He had mastered the English language before(he was in the USA.他到美国之前就懂英语了。注意:当从句主语和主句主语不一致时,从句部分要么用完全形式,要么用独立主格结构来表达。例如:When the me
23、eting was over,all the people went out of the meeting-room.当会议结束时,人们都走出了会议室。(=The meeting being over,all the people went out of the meeting-roomThe girl staring at him(=As the girl stared at him,he didnt know what to say.姑娘两眼望着他,他不知道说什么好。Time permitting(=If time permits,we will go for an outing tomo
24、rrow.如果时间允许的话,我们明天去郊游。The work done(=After the work had been done,we went home.工作完成后,我们就回家了。一、时间状语从句概念:在复合句中,由时间连接词引导的状语从句叫做时间状语从句。(在复合句中,要注意主句和从句的时态大多都要保持一致。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在.的时候Mozar
25、t started writing music when he was four years old.(在莫扎特4岁的时候,开始写音乐作品。2.while在.期间He visited a lot of places while he was traveling.他在旅行期间参观了许多地方。3.as在.的同时;一边.一边.We always sing as we walk.我们总是一边走一边唱。4.after在.之后He left the classroom after he had finished his homework.他做完作业之后就离开教室。5.before在.之前Mr.Brown
26、had worked in a bank for a year before he came here.布朗先生来这里之前已经在一家银行里工作一年了。6.as soon as一。就。We began to work as soon as we got there.我们一到那就开始工作。I will write to you as soon as I get home.我一到家就给你写信。7.since自。以来到现在表示自过去的一个起始时间点到目前(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。还可以用作介词,本句从句还可以用短语:since three years ago
27、(从三年前至今表示。Mr Green has taught in that school since he came to China three years ago.自格林先生来中国以来,他就在这所学校教书。8 till/until直到。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。(强调将一般用untilThey walked till/until it was dark.他们一直走到天黑。Xiao Ming didnt leave home till/until his father came back.小明直到他爸爸回来才离开家。9.by the tim
28、e到。为止(所在句子的主句应用完成时By the time he gets there,his father has already gone.他到家的时候,他爸爸已经走了。By the time I got to school,the class had already began.我到校时,已经开始上课了。时间状语从句注意事项1.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
29、 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 t
30、he 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.我们的校长一边谈一边笑。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,又可以是瞬间动词。并且when有时表示“就在那时”。例如:When she came in,I stopped eating.她进来时,我停止吃饭。(瞬间动词When I lived in the countryside,I used to carry some water for
31、 him.当我住在农村时,我常常为他担水。(延续性的动词We were about to leave when he came in.我们就要离开,就在那时他进来了。(瞬间动词While引导的从句的谓语动词必须是延续性的,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.我喜欢踢足球,而你喜欢打篮球。(对比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.我们总是边走边唱。(as表示“一边一边”As we was going out,it began to snow.当我们出门时,开始下雪了。(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as when while的辨析as w
