连词用法讲解精选课件.ppt

关于连词用法讲解第一页，本课件共有42页（一）并列连词：一）并列连词：并列连词可用来连接词与词，词组与词组，分句并列连词可用来连接词与词，词组与词组，分句与分句。常用的并列连词有：与分句。常用的并列连词有：and（和），（和），as well as（既（既又），又），both and（不但（不但而且），而且），not only but also（不但（不但而且），而且），not but（不是（不是而是），而是），neither nor（既不（既不也不），也不），either or（不是（不是就就是），是），or（或者），（或者），but（但是），（但是），yet（然而），（然而），for（因为），（因为），so（所以），（所以），while（而），（而），when（这时）（这时）等。如：等。如：Both my brother and my sister are teachers./His room is bright but mine is gloomy（暗沉沉的）（暗沉沉的）.He can not only repair radios but also fix them./It is a glorious（光荣的）（光荣的）yet difficult task.第二页，本课件共有42页（二）从属连词（二）从属连词从属连词是指在复合句中引导从句的连结词从属连词是指在复合句中引导从句的连结词。常。常见的从属连词有：见的从属连词有：引导时间状语从句的引导时间状语从句的：after,before,when,as,while,since,until,till,as soon as 引导原因状语从句的引导原因状语从句的：because,since,as引导让步状语从句的引导让步状语从句的：although,though,no matter（无论）（无论）,even if(though)引导条件状语从句的引导条件状语从句的：if,unless,once,so(as)long as 第三页，本课件共有42页引导结果状语从句的引导结果状语从句的：so that,such that 引导目的状语从句的引导目的状语从句的：so that,in order that 引导比较状语从句的引导比较状语从句的：as as,not so(as)as,than 引导方式状语从句的引导方式状语从句的：as if 引导主语，宾语或表语从句的连词主要有引导主语，宾语或表语从句的连词主要有：that,whether,if三个。其中三个。其中that 和和whether有时候有时候还可以引起同位从句和状语从句。还可以引起同位从句和状语从句。第四页，本课件共有42页（三）某些用法比较特殊的从属连词用法区别（三）某些用法比较特殊的从属连词用法区别1.当当while,when,as引导时间状语从句时的区别：引导时间状语从句时的区别：while引导的状语从句中引导的状语从句中动词动词必须必须是持续性。谓是持续性。谓语动词多为语动词多为进行时进行时，或，或状态动词的一般时状态动词的一般时。while 的这些用法可用的这些用法可用when代替，等于代替，等于“at the time that”,“during the time that”。例如：。例如：Please keep quiet while(when)others are studying；when除可指一段时间外，还可用来指一点时间，除可指一段时间外，还可用来指一点时间，等于等于“at the time”，也就是说，也就是说when引出的时间状引出的时间状语从句中的谓语动词可以是终止性的，也可以延续语从句中的谓语动词可以是终止性的，也可以延续性的。性的。因此主句和从句的谓语可以是一般时，因此主句和从句的谓语可以是一般时，进行时，或完成时。例如：进行时，或完成时。例如：第五页，本课件共有42页When I went into the lab,the teacher was doing an experiment.（when不能换成不能换成while、He often makes mistakes when he is speaking English.（when可换成可换成while）as常可与常可与when，while通用，但强调通用，但强调“一边、一边、一边一边”。例如：。例如：As(when,while)I was walking down the street,I noticed a police car in front of Number 37.第六页，本课件共有42页 when引导的状语引导的状语从句中的主语与主句主语从句中的主语与主句主语一致一致，从句中是，从句中是“主语主语+be动词动词”结构时，这结构时，这时主语和时主语和be动词动词可以省略可以省略。例如：。例如：When(he was)young,he worked for a rich man.when有时代替有时代替if，引导条件句，引导条件句，意为，意为“如如果果”、“假如假如”，例如：，例如：Ill come when(if)Im free.第七页，本课件共有42页2、before 的特殊用法的特殊用法before作连词一般表示时间，意为作连词一般表示时间，意为“在在之前之前”，但有些句子中这样译就显得别扭，但有些句子中这样译就显得别扭。试看。试看以下句子的翻译：以下句子的翻译：He almost knocked me down before he saw me.他几乎把我撞倒才看见我；他几乎把我撞倒才看见我；Before I could get in a word he had measured me.我还没来得及插话，他已经给我量好了尺寸。我还没来得及插话，他已经给我量好了尺寸。拓展：有关拓展：有关before特殊句型用法特殊句型用法第八页，本课件共有42页1）It will(not)be+时间段时间段+before+从句（现在时）从句（现在时）意思是意思是“要过一段时间才要过一段时间才/用不了多长时间就用不了多长时间就”It will not be long before we meet.要不了多久我们要不了多久我们就会见面的。就会见面的。It will be 5 days before you get your licence.你还有你还有5天时间就拿到证来了天时间就拿到证来了2）It was(not)+时间段时间段+before+从句（过去时），从句（过去时），意思是意思是“过了一段时间才过了一段时间才/没过一段时间就没过一段时间就”It was not long before our hometown was liberated没过多久我们的城镇就解放了。没过多久我们的城镇就解放了。第九页，本课件共有42页3、till,until 用法区别用法区别用于否定句时用于否定句时，结构为，结构为not until(till)，主句谓语动词延续与非延续都可以主句谓语动词延续与非延续都可以，意为，意为“直到直到才才”。用于肯定句时，只与延续用于肯定句时，只与延续性动词连用，性动词连用，表示表示“到到为止为止”。例如：例如：They played（延续性动词）（延续性动词）volleyball until(till)it got dark.He didnt go to bed（非延续性动词）（非延续性动词）until(till)the his father came back.；第十页，本课件共有42页until可以放在句首，可以放在句首，till则不行则不行，例如：例如：Until the last minute of the match we kept on playing.在在not until 引导的倒装句中，不用引导的倒装句中，不用till,如：如：Not until he finished his work did he go home.（倒装）；（倒装）；till,until只用于时间只用于时间，以下句子是错误的：，以下句子是错误的：We walked until/till the edge of the forest.（要用要用as far as或或to表达表达）。）。第十一页，本课件共有42页4、because,since,as引导原因状语时注意使用引导原因状语时注意使用上的区别：上的区别：如果如果原因是原因是构成句子的构成句子的最主要部分最主要部分,一般用一般用because,因此因此because引导的从句往往放在句末引导的从句往往放在句末。用用why提问的句子，一定用提问的句子，一定用because回答回答。例如：。例如：He had to stay at home yesterday because he was ill.；如原因已为人们所知，或不如句子的其他如原因已为人们所知，或不如句子的其他部分重要，就用部分重要，就用as，或，或 since。since比比as更正式更正式些。些。as和和since引导的从句一般放在句子的开头。引导的从句一般放在句子的开头。一般情况下一般情况下as译成译成“由于由于”，since译成译成“既既然然”第十二页，本课件共有42页例如：例如：As you are tired,you had better rest.Since everyone is here,now lets begin.5、although和和thoughalthough和和though引导让步状语从句往往用法一引导让步状语从句往往用法一样，但注意以下区别：样，但注意以下区别：although用于各种文体，而用于各种文体，而though则多用于非则多用于非正式的口语或书面语中。注意正式的口语或书面语中。注意由由although,though引导的从句后，主句不能用引导的从句后，主句不能用but，但可用但可用副词副词yet,still。例如：。例如：Although/Though it rained all the morning,they still went on working.（或（或yet they went on working）第十三页，本课件共有42页 though常与常与even连用，构成连用，构成even though 短短语，语，even though表示强调，意为表示强调，意为“即使即使”，但不能说但不能说even although，例如：，例如：Even though I didnt understand a word,I kept smiling.though可用作可用作副词副词，意为，意为“可是，然而可是，然而”，常用逗号与句子分开。例如：常用逗号与句子分开。例如：It was a quiet party,I had a good time,though.although则不能这样使用，它只作连词。则不能这样使用，它只作连词。第十四页，本课件共有42页6、once用法用法once作副词译作副词译“曾经曾经”，作为连词译，作为连词译“一一旦旦”，引导条件状语从句。相当于，引导条件状语从句。相当于if的加强的加强形式。例如：形式。例如：I dont believe he was once a thief.(once这里是副词这里是副词)Once Aristotle had made up his mind that heavy objects always fell faster than light objects,he taught it as a truth to his students.(once连词连词)第十五页，本课件共有42页7、unless引导条件状语从句等于引导条件状语从句等于if not。例如：。例如：Hell accept the job unless the salary is too low.=Hell accept the job if the salary is not too low.看下列这道题看下列这道题 He had never been praised before _he went to university.A unless B.until C.when D,ifB.Until从从句中时态：句中时态：主将从现主将从现第十六页，本课件共有42页8、在用、在用as if引导的方式状语从句及引导的方式状语从句及表语从句中，根据情况要使用虚拟表语从句中，根据情况要使用虚拟语气。例如：语气。例如：He talks as if he knew all about it.但但有时也可用直陈语气。例如：有时也可用直陈语气。例如：It looks as if it is going to rain.第十七页，本课件共有42页9、whether,if引导从句的用法区别：引导从句的用法区别：引导主语从句、表语从句或同位语从引导主语从句、表语从句或同位语从句时，用句时，用whether，不用，不用if。例如：例如：Whether they will go to the Great Wall is not known.The question is whether we can finish the task on time.The question whether we will take part in the physics contest has not been decided.第十八页，本课件共有42页 whether可接不定式，而可接不定式，而if则不可则不可。例如：。例如：I havent decided whether to leave or not.whether可作介词的宾语或置于句首表示强调，可作介词的宾语或置于句首表示强调，而而if则不可。例如：则不可。例如：Everything depends on whether we have enough money.Whether he will come,I am not sure.whether和和if均可引导宾语从句，均可引导宾语从句，whether引引导的宾语从句一般都是肯定句，导的宾语从句一般都是肯定句，if引导的宾语从引导的宾语从句可以是肯定的，也可以是否定的（此时不能用句可以是肯定的，也可以是否定的（此时不能用whether），例如：），例如：Could you tell us whether/if it rains in winter in Australia?I wonder if it doesnt rain.第十九页，本课件共有42页 引导宾语从句的引导宾语从句的whether和和if常可与常可与or not连连用。连用时要注意用。连用时要注意or not的位置，有时候与的位置，有时候与 whether、if分开使用，有时它可与分开使用，有时它可与whether合合起来使用，但起来使用，但不能与不能与if合起来使用合起来使用。例如：。例如：I dont know whether/if they will come or not.I dont know whether or not they will come.（这时候不能用（这时候不能用if）if可用来引导条件状语从句，译可用来引导条件状语从句，译“如果如果”，whether则不行。例如：则不行。例如：If you work hard,you are sure to succeed.第二十页，本课件共有42页10、as作从属连词可引导多种状语从句。作从属连词可引导多种状语从句。as引导时间状语从句，意为引导时间状语从句，意为“当当时时”。例如：。例如：As(he was)a young man,he was a storekeeper and later a postmaster./He sang as he worked.as引导方式状语从句，意为引导方式状语从句，意为“象象一样一样”。例如：。例如：We must do as the Party teaches us.as引导原因状语从句。意为引导原因状语从句。意为“由于由于”，例如：，例如：As you are tired,you had better rest.as引导让步状语从句。意为引导让步状语从句。意为“虽然虽然”、“尽管尽管”Child as he is,he can do it well.(=Although he is a child,he can do it well.)另外，另外，as做为关系代词还可以引导定语从句，如：做为关系代词还可以引导定语从句，如：I have the same book as you.第二十一页，本课件共有42页 专项巩固专项巩固-连词连词 请同学们做试卷上的习题请同学们做试卷上的习题第二十二页，本课件共有42页练习、连词练习、连词1.He is very old,_ he still works very hard.A.but B.if C.when D.as2._ you are dismissed.A.Neither you go nor B.Either you go orC.Whether you go or D.Both you go and3.They had camped露营露营 once before,_ they knew what to take.A.because B.now C.so D.since第二十三页，本课件共有42页4.Why these things happened was _ the driver had been careless.A.because of B.owing toC.due to D.that5.Although,its raining,_are still working in the fields.A.they B.but they C.and theyD.so they6._we have satisfied you,you have no grounds理由理由 of complaint.A.So B.Since that C.Now that D.By now.第二十四页，本课件共有42页7.Write clearly _ your teacher can understand you correctly.A.since B.for C.because D.so that8.Youll miss the train _ you hurry up.A.unless B.as C.if D.until9.Francis did the task_ his brother.A.as good as B.as better as C.as well as D.as best as10.The size of the audience,_ we had expected,was well over twenty thousand.A.as B.what C.that D.whom第二十五页，本课件共有42页11.I thought he hated the TV.You are right,_ he still watches the program.A.yet B.besides C.also D.then12.It looks _ its going to rain.A.that B.as C.as if D.like that13._ to New York,her father has not heard from her.A.Because she went B.After she wentC.When she went D.Since she went14._he daydreamed,Peter saw figures in the sky.A.Until B.Since C.While D.During第二十六页，本课件共有42页15.We arrived at the station _ the train had left.A.after B.before C.since D.when16._ he was in poor health,he worked just as hard as everyone else.A.But B.Although C.Even if D.If17.Give me one more minute _ Ill have finished.A.so B.until C.and D.when18.The worker hunted for jobs in New York for months,_ he could not find any work.A.and B.yet C.or D.and but第二十七页，本课件共有42页19.Hurry up,_ youll be late.A.or B.and C.so D.yet20.Do not make the same mistake _ I did.A.so B.as C.like D.that21.My sister is waiting for me,_ I must be off now.A.however B.or C.so D.otherwise22.We should pay attention _ to industry _ to agriculture.A.either,or B.neither,nor C.not,but D.both,and第二十八页，本课件共有42页23.He ran off_ I could stop him.A.before B.after C.since D.when24._ you told me,I had heard nothing of what happened.A.Till B.Until C.After D.Since25.Where have you been _ you left home?A.before B.as C.since D.when 26._ the problem of method is solved,talking about the task is useless.A.Until B.SinceC.AfterD.Unless第二十九页，本课件共有42页27.We have produced 15%more cotton this year_ we did last year.A.as B.than C.like D.white28.It is late;_,Im too tired to go out.A.besides B.except C.except for D.except that29.Everything around us is _ solid.liquid _ gas.A.not.but.B.either.or.C.neither.nor.D.whether.or.30.He will come _ you ask him.A.whether B.unless C.if D.while第三十页，本课件共有42页31._ he will come or not is still unknown.A.If B.Where C.That D.Whether32.I don t know _ to stay at home or go out.A.whether B.if C.how D.where33.He spoke loudly _ the audience could hear him clearly.A.so B.that C.so that D.in order to第三十一页，本课件共有42页34.The book is not easy._ its rather difficult.A.On the one hand B.On the contrary C.On the other hand D.On the other contrary35.You must work hard,_ you will not learn English well.A.if B.whether C.otherwise D.unless36.It rained heavily,_ the basketball match had to be put off.A.so that B.when C.otherwise D.therefore第三十二页，本课件共有42页37.We must do _ the people want us to do.A.whatever B.however C.wherever D.whenever38.You are certainly right,_ others may say.A.what B.whatever C.that D.as39._ makes mistakes must correct them.A.Who B.What C.Whoever D.Whatever40.Ill discuss it with you _ you like to come.A.when B.where C.whoever D.whenever第三十三页，本课件共有42页41._ you work,you must always serve the people heart and soul.A.Wherever B.Whenever C.Where D.When42._you understand this rule,you will have no further difficulty.A.Once B.At once C.Only D.Only then43._ difficult the task may be,we must fulfil it this month.A.No matter how B.No matter what C.No matter when D.No matter where第三十四页，本课件共有42页44.We can surely overcome these difficulties _,_ we are closely united.A.so far as B.so long as C.as soon as D.as well as45._ I know he will stay here for half a year.A.as soon as B.as long as C.so far as D.as well as46.Please write me _ you arrive in New York.A.as well as B.so long as C.as far as D.as soon as第三十五页，本课件共有42页47.That is not _ I want.A.that B.why C.what D.whose48._ he did it remains a secret.A.What B.Whom C.Which D.How49.It is quite clear _ he wont see us.A.what B.that C.why D.how50.Would you tell me _ way I should take?A.what B.that C.which D.whose51.I am sure _ you said is true.A.what B.that C.which D.who第三十六页，本课件共有42页52.The trouble is _ we can not find such an expert.A.why B.that C.where D./53.It has not been decided _ they will leave.A.why B.when C.which D.what54.We shall go _ you are ready.A.while B.as soon as C.as D.since55.He will tell you about it _ you get there.A.while B.as C.when D./第三十七页，本课件共有42页56.Dont try to get off the bus _ it has stopped.A.while B.as C.since D.before57.Ill come and see you _ I go to the countryside.A.while B.when C.as soon as D.before58._ he came to study in the university,he has made much progress in the study of English.A.While B.When C.Since D.After第三十八页，本课件共有42页59.Things have changed a lot _ I wrote to you last time.A.when B.since C.as D.before60.I cant use your pen,_ there is no ink in it.A.for B.when C.if D.whether 61.Id like to go swimming _ the water is not too cold.A.for B.unless C.if D.whether62.Difficulties are nothing _ we are not afraid of them.A.for B.as C.if D.whether第三十九页，本课件共有42页63.The doctor will not perform the operation _ it is absolutely necessary.A.when B.if C.for D.unless64.Go back _ you came from.A.until B.where C.which D.when65.He lay _ the grass was the thickest.A.where B.when C.that D.after66.You will find friendly people _ you go in China.A.where B.and C.wherever D.so67._ it was already dark,they went on working in the fields.A.If B.Whether C.But D.Though第四十页，本课件共有42页68._ he has finished writing the novel is unknown.A.If B.Whether C.When D.While69.Well go and see the patient _we are busy.A.even if B.for C.if D.while70.The museum is _ far _ it will take us half an hour to get there by bus.A.such.that B.as.as C.so.that D.so as第四十一页，本课件共有42页感谢大家观看第四十二页，本课件共有42页