初中英语专题讲义之连词

1、连词1、连词的含义：连词是一种虚词 ,不承当句子的任何成分 ,是一种连接词与词、短语与短语、或引导从句的词。2、连词的分类：连词分为并列连接词和附属连接词两种。、并列连接词连接并列的词、短语、从句或句子。常见有：and(和),but(但是),or(或者,否那么),nor(也不), so(所以), however(然而,无论如何),for(因为),still(可是),as well as(也), both.and.(.和.), not only .but also.(不但而且), either or(或或),neither nor(既不也不)等。补充：(1)表并列关系的and, bothand,

2、 not onlybut also, neithernor等。(2)表选择关系的or, eitheror等。(3)表转折关系的but, while等。(4)表因果关系的for, so等。、附属连接词用于引导从句,常见的有：when(当时候), while(正当时候), after(在之后), before(在之前), since(自从), until(直到), although/though(虽然), if(假设), as(如一样；由于), as as(和一样), as far as(就而言), as long as(只要), as soon as(一就), even if(即使), beca

3、use(因为), unless (除非), than(比), whether (是否), in order that(为了), sothat(如此以致), so that(以便), now that(现在既然), by the time(到时候), every time(每当), as if(好似),no matter when(或whenever)(无论何时),no matter where(或wherever)(无论在哪里)等。补充：(1)引导时间状语从句的after, before, when, while, as, until, till, since, as soon as等。(2)

4、引导条件状语从句的if, unless等。 (3)引导原因状语从句的because, as, since等。(4)引导目的状语从句的so that, in order that等。 (5)引导让步状语从句的though, although, even if等。(6)引导结果状语从句的so that, sothat, suchthat等。 (7)引导比拟状语从句的than, asas等。(8)引导名词从句的that, if , whether等。辨析 ： (1)Hurry up, or youll miss the train. (快点 ,否那么你会错过火车) Hurry up, and you

5、ll catch the train. (快点 ,你会赶上火车的)(2) not only .but also.(不但而且), either or(或或),neither nor(既不也不) ,这三个连词词组都可连接两个并列成分。当它们连接两个并列主语时 ,谓语动词要随相邻的主语变化。例:Either you or he is wrong. /Neither he nor his children like fish.不但他不喜欢而且他的孩子也不喜欢鱼。Not only the teacher but also the students want to buy the book.不但老师而且学

6、生想买这本书。(3) because、as、since、for的用法：because(因为) ,引导原因状语从句。表示原因的语气最强,常表示必然的因果关系,从句常放主句后面；答复why的问句只能用because. eg：He is not at school today because he is seriously ill.as(因为) ,引导原因状语从句。表示一般的因果关系,语气比because弱,说明比拟明显的原因,它引导的从句放在句首 ,句尾都可以。As all of you have got here, now, lets go to the zoo.since(既然) ,引导原因状

7、语从句表示对方已经知道、无需加以说明的原因或事实。I will ask Lin Tao to go with me since you are very busy. 更多资料QQ378459309制作：for(因为)是并列连词, 引导并列句。语气较弱,用来补充说明理由或提供一种解释 ,只能放在主句后面。We must be off now for the match starts at 7：00. (4)if、whether的区别：相同点：表示“是否时,if和whether同义,引导宾语从句, I dont know if/whether he will arrive on time.不同点：

8、whether提出两种选择时要用whether ,不用if. 如Let me know whether he can come or not. 在不定式前或介词后只用whether. eg: Please ask him whether to go there with a raincoat or not.I have not settled the question of whether I will go home. whether与or not连用时, if不可以whether引导主语从句或表语从句,Whether it is a fine day next Sunday is stil

9、l a question. / The question is whether he will go.If “是否意思不能放句首 ,whether可以. eg: Whether she is at home, I can not say.而if还可以表示“如果,引导条件状语从句,(主句与从句遵循主将从现的原那么)。 I will ring you up if he arrives on time. (5)while、when、as的用法区别：while常表示一个较长的动作,它引导的从句动作与主句的动作是同时发生的、是平行的；when可表较短的动作也可表较长的动作,主句和从句的动作可同时发生也可

10、先后发生；as与上两词同义,可替换while和when,表示主句和从句的动作同时发生,常译为“一边一边 ,主句从句均为短动作时也常用as。Please do not trouble me while I am writing my homework. / Ill go home when I have finished my job. They were running quickly across the road when they heard the sound of a truck coming.As we walked in the dark street, we sang song

11、s and talked loudly.(6)till/until与nottill/until的区别：till/until (肯定)主句常是一个延续性的动作, nottill/until否认主句常是一个短暂性动作。(都是引导时间状语从句 ,符合主将从现的原那么)如：I will stay here and watch the baby until you return.我会呆在这里看着娃娃直到你回来(stay这个动作是一个延续性动作 ,一直进行到你return) I wont go to bed until my father comes back.直到我父亲回来我才会去睡觉 ,go是一个短动

12、作 I didnt go to bed until my father came back.直到我父亲回来我才去睡觉 ,从句动作应该在主句动作前发生 ,也就是先父亲先回来,我才去睡觉 He didnt tell me anything_ he left. (青岛试题) A. until B. before C. after D. Since 另外till与until根本可以互换,但是在句首时只能用until,不能用till. 如：Until the last minute of the match we kept playing. Not until he had finished his w

13、ork did he go home.直到做完工作他才回家倒装句(7)though与although的区别：两个词都表示“虽然,均不可以与but同时使用,但在句中可加still或yet连用。He passed the exams although illness prevented him from going to classes.although“尽管、虽然仅作连词,比拟正式,一般可换为though；though“虽然、尽管、即使,可与even连用(even though= ),表示“即使、纵然, She wont leave the TV set, even though her hus

14、band is waiting for her for the supper.though还可作副词时意思是“然而、不过,不能放在句首。It was a quiet party. I had a good time, though.这是个不热闹的聚会尽管如此我还是玩得很开心 (8)prefer torather than与preferto的区别：prefer to do sth rather than do sth宁愿做某事 ,而不愿做某事情 I prefer to learn English rather than learn Japanese.preferto都是用动名词或名词。I prefer English to Japanese. / I prefer staying at home to going swimming. 9 sothat中的so是个副词 ,其后只能跟形容词或副词 ,而such.that中的such是个形容词 ,后接名词或名词短语。例如：Im so tired that I