有关as作连词的用法

有关as作连词的用法一．as引导状语从句as作为连词可以引导状语从句，表示时间、原因、方式、让步等。

1. 引导时间状语从句，意思是“当``````的时候”，同when/while,更强调“一边``````一边``````”。

表“随着``````”的意思时同with,但with是介词，不可以跟从句。

eg: I saw him as he was getting off the bus.He often listens to the music as he is doing his homework.As time goes by, his illness is getting worse.2. 引导原因状语从句，同since。

eg: We had better hurry as it is getting dark.As she has no car, she can’t get there easily.有关as作连词的用法一．二．as引导定语从句1. as引导限制性定语从句。

as作为关系代词可以引导限制性定语从句，通常与the same或such连用，构成the same ``````as和such``````as句型。

eg: I have never heard such stories as he tells.This is the same dictionary as I lost.有关as作连词的用法要用倒装结构。

可以把从句中表语、状语甚至谓语动词置于句首，如果是带有冠词的可数名词单数作表语，置于句首时应省去冠词。

eg: Young as he is, he knows a lot about history.Much as I like you, I will not marry you.Try as she might, Mary couldn’t get the door open.Boy as he is, he is very shy. (boy前省略冠词a)4. 引导方式状语从句，表示方式。

意思是“像，按照，如同”。

eg: Do it as I do it.You should finish your task as you are told to.Leave it as it is.有关as作连词的用法2. as引导非限制性定语从句。

as与which一样都可以引导非限制性定语从句，但是as引导的从句可以放在主句之前、主句之后，甚至还可以分割主句；而which引导的非限制性定语从句只能放在主句之后。

另外as还有“正如、就像”之意。

eg: As is mentioned above, the number of the students in senior high schools is increasing.He was admitted to college, which made his parents very happy.John, as you know, is a writer.动词不定式动词不定式是非谓语动词的一种，它没有人称和数的变化，在句子中不能独立作谓语，但它仍保持动词的特点，既可以有自己的宾语和状语。

动词不定式的构成：to+动词原形动词不定式作主语动词不定式作主语时句子有以下两种(1)把不定式置于句首。

如：To get there by bike will take us half an hour.(2)用it作形式主语，把真正的主语不定式置于句后It will take us half an hour to get there by bike.常用句式有①It＋be＋名词＋to doIt‘s our duty to take good care of the old.②It takes sb+some time+to doHow long did it take you to finish the work?③It＋be＋形容词＋for sb＋to doIt is difficult for us to finish writing the composition in a quarter of an hour.④It seems＋形容词＋to doIt seemed impossible to save money动词不定式作宾语后面能接不定式作宾语的动词有：agree, ask, choose,decide, forget, hope, learn, want, wish, would like等。

如：We hope to get there before dark. 我们希望天黑以前到那儿。

The girl decided to do it herself. 那个姑娘决定自己做那件事。

动词不定式作宾语的注意事项（2点）1．有些动词既可跟不定式作宾语，也可跟动名词作宾语，但含义不同：remember to do 记住要做某事；remember doing 记得曾经做过某事forget to do忘记要做某事forget doing 忘记曾经做过某事stop to do 停下来去做某事stop doing 停止做某事go on to do 继续做另一件事go on doing 继续做原来在做的事I remember seeing you somewhere before.我记得以前在哪儿见过你。

Please remember to turn off the light when you leave.离开时请记得关好灯。

2．不定式作宾语时，如带有宾语补足语，则要把不定式放到后面，用it作形式宾语，构成“主语+动词+it+宾补（形容词、名词）+不定式”结构。

如：He found it very difficult to get to sleep.他发现很难入睡。

动词不定式作宾语补足语1．后面能接to不定式作宾语补足语的动词有：ask, order, teach, tell, want, wish, help 等。

The teacher told us to do Exercise 1.老师要我们做练习一。

I want both of you to go.我要你们俩去。

We helped her (to) repair her bike.我们帮助她修理自行车。

2．使役动词let, have, make及感官动词see, watch, notice, hear, feel等要以不带to 的不定式作宾补。

Let’s have a rest. 我们休息一会吧。

I saw him come in. 我看见他进来了。

感官动词后既可跟不带to的不定式作宾补，也可跟v-ing作宾补，前者表示动作的全部过程已结束；后者表示动作正在进行。

I saw him come downstairs.我看见他下了楼。

（说明他下楼了这件事）I saw him coming downstairs.我看见他在下楼。

（说明他下楼时的情景）动词不定式作定语1、不定时要放在所修饰的名词、代词之后。

Would you like something to eat?He has a important meeting to have.2、如果动名词与所修饰的名词与代词之间构成逻辑上的动宾关系，因此若不定式的动词是不及物动词时要加上相应的介词They want a big room to live in.动词不定式作表语动词不定式作表语的语法功能，在初中阶段不作为考查项目，但是往往会在完形填空或阅读理解中出现，所以对此有多了解会有助于你的阅读能力。

动词不定式放在系动词之后作表语；My job is to clean the street every day.His dream Is to be a doctor动词不定式作状语1. 作目的状语He ran fast to catch the first bus.He came here only to say goodbye to us.2. 作结果状语He searched the room to find nothing.3. 作原因状语I’m glad to see you.特殊疑问词与动词不定式连用特殊疑问词＋To do 往往与宾语从句相互转I don’t know what to do.=I don’ t know what I should do.类似的疑问词还有when, where, whom, which, how动词不定式的否定形式动词不定式的否定式是在to前加not；不带to的不定式则在动词前加not. 如：Zhang Ming asked me not to stay at home all day.张明要我不要整天呆在家里。

My mother let me not do it by myself.妈妈让我不要独自做这件事。

To 的几种常见用法too…to… / not +adj.+enough to do…He is too careless to finish the work well.He is not careful enough to finish the work well.He is so careless that he couldn't finish it well.He is such a careless boy that he couldn't …be to do…表示按照计划或者安排将要发生的动作used to do …表示过去常常干某事have to do…不得不作某事同步练习1. We want to play basketball after school. Would you like __________ (join) us?2. Meimei likes English very much. She does her best _______ (learn) English well.3. It is better to teach a man fishing than ______ (give) him fish.4. Though Tom missed many lessons, he tried hard __________ (not fall) behind.5. The little boy _____________ (ask) to do his homework just now.6. Never forget ________ (say) “Excuse me”, when you trouble somebody.7. Who told the man _______ (not be) late for school?8. So much work usually makes them ______ (feel) very tired.9. Let’s go and ______ (play) games.10. They will spend their holiday in Guilin, but we haven’t decided where _____ (go).倒装句种种一.正常词序1. The accident happened late in the afternoon. (绝大部分陈述句)2. What has happened to you?(疑问词作主语的特殊疑问句)3. Which building was destroyed?(疑问词修饰主语的特殊疑问句)二. 倒装词序1. 主谓倒装A. 部分倒装(即一般疑问句词序)Did the accident happen late in the afternoon?B. 全部倒装Out rushed the woman.2. 非主谓倒装Proud as/though he is, he is afraid to see me. (表语倒装)=Though he is proud, he is afraid to see me.三. 主谓倒装A. 部分倒装(主谓像一般疑问句那样倒装)1. 疑问句(疑问词作主语或作主语的修饰语除外)( The bell has rung. )1) Has the bell rung?( Everything he had was taken away from him during the Second World War.)2) When was everything he had taken away from him?2. “ Only + 状语” 放在句首时(He told me the truth only after his wife left.)Only after his wife left did he tell me the truth.3. 当not only … but also …连接两个句子时,前一句主谓要部分倒装(The city was polluted and the streets were crowded, too.)Not only was the city polluted but also the streets were crowded.4. so (表示“如此……”)放在句首时( I felt it so difficult to live in an English-speaking country that I was determined to learn English well.)So difficult did I feel it to live in an English-speaking country that I was determined to learn English well.5. so (表示“也……”)放在句首时; nor / neither (表示“也不…….”)放在句首时(Smelling a rotten egg is an experience and taking medicine is an experience, too.)1) Smelling a rotten egg is an experience. So is taking medicine.(I have never been abroad and my wife has never been abroad, either. )2) I have never been abroad. Nor has my wife.注意:1) 加前缀或后缀( un__, im__, __less等)视为肯定句.( The young man was impolite to us. His father was impolite to us, too.)The young man was impolite to us and so was his father.2) “So + 主谓部分倒装” 表示“……也……” ;“So + 主谓不倒装” 表示“的确……”If he goes to see you off at the airport, so will I.(= I will go to see you off at the airport, too)---- I hear Tom sat up far into the night.---- So he did.6.当否定词、半否定词或否定词组放在句首时( He no more cared what his friends thought about him. )1) No more did he care what his friends thought about him.He wasn’t set f ree until liberation. )2) Not until liberation was he set free.( He had hardly gone to bed when the telephone rang )3) Hardly had he gone to bed when the telephone rang.( They cleaned the entire house in no time. )4) In no time did they clean the entire house .TV sets can never take the place of cinemas.)5) Never can TV sets take the place of cinemas.(She did not sing a single song at yesterday’s party.)6) Not a single song did she sing at yesterday’s party.7. 虚拟条件从句中含有should, were 或had时,可以去掉if, 主谓进行部分倒装.(If I had been born a few years earlier, I would join the army.)1) Had I been born a few years earlier, I would join the army.( Your wife would not be pleased to hear that if she were here now. )2) Your wife would not be pleased to hear that were she here now.B. 全部倒装1. 以There / Here / Out / In / Away / Up / Down开头的句子1) Here is a letter for you.3) There goes the bell.4) There was a sudden wind and away went his hat.5) The door burst open and in rushed the crowd.但是:当主语是人称代词时,主谓不要倒装.1) Here it comes.2) Here they are.3) Out she rushed.3. 一个较长的地点状语短语放在句首时,如果主语长,谓语短,需要全部倒装.1) In a lecture hall of a university in England sat an old professor with a heavy book under his arm.2) From the valley came a gun shot.3) They arrived at a farmhouse, in front of which stood a peasant boy.4) In this passage will be found the answer to the question.4. 当直接引语的一部分或全部放在句首时,引号外的主谓可以全部倒装,也可以不倒装.1) “I think we’re lost.” said my brother.(也可以: “I think we’re lost.” my brother said.)2) “ If I die,” asked he, “ who will take my place?”(也可以: “If I die,” he asked, “who will take my place?”)四. 非主谓倒装1. 感叹句( He is singing beautifully. )1) How beautifully he is singing ! (状语倒装)( You are all very silly. )2) How silly you all are !(表语倒装)( You’ve made so many mistakes in this exam. )3) What a lot of mistakes you have made in this exam!(宾语倒装)(I wish very much to go there.)How I wish to go there! (状语倒装)2. 为了前后衔接紧密, 将宾语倒装( 放在句首).Then they asked the king for more silk and gold thread. All this they kept for themselves.(宾语倒装)3. 当as表示”虽然”、“尽管”时,必须将表语,状语或主要动词倒装.1) Tired as they were, Alice and Jane sat up very late to see the new year come.( 表语倒装)2) Hero as he is , he has some shortcomings. (表语倒装)3) Hard as they worked, they didn’t finish the task ahead of time. (状语倒装)4) Try as you might, you will not succeed. (主要动词倒装)定于从句1. The girl _______ is sitting in the chair is a good singer.2. The skirt __________ Mary bought two years ago is old.3. Is this the novel __________ you introduced to me?4. Where is the boy _______ broke the window?5. Luckily none of the people_________I know were killed in the earthquake.•Attributive Clause（定语从句）概念在复合句中，修饰某一名词或代词的从句叫做定语从句.被修饰的名词或代词叫先行词He is an English teacher who likes singing songs引导词关系代词:who﹑whom﹑that﹑which﹑whose关系副词:where﹑when﹑why注意：1 关系代词和关系副词在定语从句中都要充当句子成分。