2012届高考一轮复习英语语法专项十七:连-词(共8页).doc
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1、精选优质文档-倾情为你奉上2012届高考一轮复习语法专项十七:连 词连词分为并列连词和从属连词两大类。并列连词是连接主语与主语,谓语与谓语,句子与句子,分词与分词的词,它要求前后两部分有相同的形式和语法作用;而从属连词一般连接主句与从句,从句形式有名词性从句,定语从句和状语从句等。(一)并列连词: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:and(和),as well as(既又),both and(不但而且),not only but also(不但而且),not but(不是而是),neither nor(既不也不),either or(不是就是),or(或者),b
2、ut (但是),yet(然而),for(因为),so(所以),while(而),when(这时)等。如:Both my brother and my sister are teachers./ His room is bright but mine is gloomy(暗沉沉的)./ He can not only repair radios but also fix them./ It is a glorious(光荣的)yet difficult task./ Strike while iron is hot.(二)从属连词从属连词是指在复合句中引导从句的连结词。常见的从属连词有:引导时间
3、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:because, since, as引导让步状语从句的:although, though, no matter(无论), even if (though)引导条件状语从句的:if, unless, once, so (as) long as 引导结果状语从句的:so that , such that 引导目的状语从句的:so that , in order that 引导比较状语从句的:as as , not so (as) as , t
4、han 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:that, whether, if三个。其中that 和whether间或还可以引起同位从句和状语从句。(三)某些用法比较特殊的从属连词用法区别1、当while, when, as引导时间状语从句时的区别:while引导的状语从句中动词必须是持续性。谓语动词多为进行时,或状态动词的一般时。while 的这些用法可用when代替,等于 “at the time that”, “during the time that”。例如:Please keep quiet while (when) others are study
5、ing; when除可指一段时间外,还可用来指一点时间,等于 “at the time”,也就是说when引出的时间状语从句中的谓语动词可以是终止性的,也可以延续性的。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:When I went into the lab, the teacher was doing an experiment.(when不能换成while)He often makes mistakes when he is speaking English.(when可换成while)as常可与when,while通用,但强调“一边、一边”。例如:As (when, wh
6、ile) I was walking down the street, I noticed a police car in front of number 37. when引导的状语从句中的主语与主句主语一致,主、谓是“主语+系动词”结构时,这时主语和系动词可以省略。例如:When (he was) young, he worked for a rich man./ Shell be here to give you help when (if it is) necessary. when有时代替if,引导条件句,意为“如果”、“假如”,例如:Ill come when (if) Im fre
7、e.2、before作连词一般表示时间,意为“在之前”,但有些句子中这样译就显得别扭。试看以下句子的翻译:He almost knocked me down before he saw me.他几乎把我撞倒才看见我;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。3、till, until作为介词式从属连词引导时间状语短语或状语从句,用于否定句时,结构为not until (till),主句谓语动词延续与非延续皆可,意为“直到才”。用于肯定句时,只与延续性动词连用,表示“到为止”。例如:They playe
8、d volleyball until (till) it got dark./ They didnt talk(延续性动词)until (till) the interpreter(译员)came./ He didnt go to bed(非延续性动词)until (till) the his father came back.;until可以放在句首,till则不行,例如:Until the last minute of the match we kept on playing./ Not until he finished his work did he go home.(倒装);till
9、, until只用于时间,以下句子是错误的:We walked till the edge of the forest.(要用as far as或to)。4、because, since, as引导原因状语时注意使用上的区别:如果原因构成句子的最主要部分,一般用because ,因此because引导的从句往往放在句末。用why提问的句子,一定用because回答。例如:He had to stay at home yesterday because he was ill.;如原因已为人们所知,或不如句子的其他部分重要,就用as,或 since。since比as更正式些。as和since引导的
10、从句一般放在句子的开头。例如:As you are tired, you had better rest./ Since everyone is here, now lets begin.5、although和though引导让步状语从句往往用法一样,但注意以下区别:although用于各种文体,而though则多用于非正式的口语或书面语中。注意由although, though引导的从句后,主句不能用but,但可用副词yet, still。例如:Although/ Though it rained all the morning, they still went on working.(或y
11、et they went on working)though常与even连用,even though表示强调,意为“即使”,但不能说even although,例如:Even though I didnt understand a word, I dept smiling. though可用作副词,意为“然而”,常用逗号与句子分开。although则不能这样使用,它只作连词。例如:It was a quiet party, I had a good time, though.6、once作副词译“曾经”,作为连词译“一旦”,引导条件状语从句。相当于if的加强形式。例如:I dont belie
12、ve he was once a thief. (once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)7、unless引导条件状语从句等于if not 。例如:Hell accept the job unless the salary is too low. ( = Hell accept the job if the salary is
13、not too low.)8、在用as if引导的方式状语从句及表语从句中,根据情况要使用虚拟语气。例如:He talks as if he knew all about it. 但有时也可用直陈语气。例如:It looks as if it is going to rain.9、whether, if引导从句的用法区别:引导主语从句、表语从句或同位语从句时,用whether,不用if。例如:Whether they will go to the Great Wall is not known./ The question is whether we can finish the task o
14、n time./ The question whether we will take part in the physics contest has not been decided. whether可接不定式,而if则不可。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,而if则不可。例如:Everything depends on whether we have enough money./ Whether he will come, I am not sure. whether和if均可引导宾语从句
15、, whether引导的宾语从句一般都是肯定句,if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whether),例如:Could you tell us whether/ if it rains in winter in Australia?/ I wonder if it doesnt rain. 引导宾语从句的whether和if常可与or not连用。连用时要注意or not的位置,它一般与 whether、if分开使用,有时它可与whether合起来使用,但不能与if合起来使用。例如:I dont know whether/ if they will come or not
16、./ I dont know whether or not they will come.if可用来引导条件状语从句,译“如果”,whether则不行。例如:If you work hard, you are sure to succeed.10、as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“当时”。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“象一样”。例如:We must do as the Party
17、 teaches us.as引导原因状语从句。意为“由于”,例如:As you are tired, you had better rest.as引导让步状语从句。意为“虽然”、“尽管”Child as he is, he can do it well. ( = Although he is a child, he can do it well.)另外,as做为关系代词还可以引导定语从句,如:I have the same book as you.练习、连词1 .He is very old,_ he still works very hard. A. but B.if C.when D.as
18、2. _ you are dismissed.A. Neither you go nor B. Either you go or C. Whether you go or D. Both you go and3. They had camped once before, _ they knew what to take.A. because B. now C. so D. since4. Why these things happened was _ the driver had been careless. A. because of B. owing toC. due to D. that
19、5. 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 of complaint.A. So B. Since that C. Now that D. By now.7. Write clearly _ your teacher can understand .you correctly.A. since B. for C. becauseD. so that8
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