huzhanghua88
as的用法 as这个词看似简单，但用法却是很多的，对它的正确理解关系到英语应用能力的提高，因此我们有必要对其用法和搭配进行详细阐述。一、as作介词1. 区别as和likeas作为介词时，可以表示“像……”，这时它可以和like互用；as还可以表示“以……身份”或“作为……”，“当作……”，但like不能。e.g. I) They lived and fought among the people as “fish in water”. (as相当于like)II) As a scientist, he was dedicated to (致力于) the truth. (这里不可以用like)II) They talked as old friends. (他们确乎是老朋友。)à They talked like old friends. (他们像老朋友一样。)2. as引导的介词短语在句中可以充当：a) 宾语补足语e.g. I) She spoke of me as her dearest friend.II) The plan struck me as very much worthwhile.III) You mustn’t think of me as (being) unhappy.b) 主语补足语 e.g. I) She is well-known as being very cheerful.II) He is sometimes portrayed as belonging to another century.III) That picture is looked upon as very valuable.常用于这类结构的动词有：accept, consider, describe, elect, interpret (理解), look upon, perceive, recognize, refer to, regard, see, strike, take, think of, treat, view等等。二、as作连词1. 作“当……的时候”,引导时间状语从句。注意与when、 while的用法区别。A. when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。e.g. I)When he was at college, he could speak several foreign languages.II) When the clock struck twelve, all the lights in the street went out. B. while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。e.g. Work while you work. Play while you play.C. 但属下列情形时,只用as, 而不用when或while。1) 用于表示同一个人的两种动作交替进行,指“一边……,一边……”。e.g.I)The girl dances as she sings on the stage. II) He looked behind from time to time as he went forward.2)表示两个同步发展的动作或行为,译为“随着……”。e.g. I) As time went on / by, she became more and more worried. II) As children get older, they become more and more interested in the thingsaround them. 3)表示两个短促行为或事件几乎同时发生。e.g. I) I thought of it just as you opened your mouth. II) Just as the flying worm hit her face, she gave a loud cry.4) 后接名词表示某一年龄段时,用as。e.g. As a young man, he was active in sports. 2. as=since, 作“既然”、“由于”解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。e.g. I)As / Since you’re not feeling well, you may stay at home.II) As he wasn't ready in time, we went without him.3. as=in the way that, 作“像”、“按照……的方式”解，引导方式状语从句。e.g. I)He speaks English as Americans do.II) Remember, you must do everything as I do.4. 用于as...as...或not so/ as...as...中,前一个as是副词,后一个as是连词，引导比较状语从句。e.g. I) They helped the old man as often as possible. II) I don’t speak English so / as well as he does. 5. 作“虽然”、“尽管”解,引导让步状语从句。常用倒装语序,即adj. /adv. / n.+ as +主语+谓语+主句。e.g. I) Tired as they were, they walked on.II) Child as he is, he knows a lot. (child前不用冠词)6．as引导类比从句，与so 连用，表示“正如……所以……”。e.g. Just as French people enjoy their wine, so the British enjoy their beer.如同法国人喜欢他们自产的葡萄酒一样，英国人喜欢他们自产的啤酒。三、as作副词1．表示同等程度、质量、数量等，作“一样地……”解释。e.g. I) Steve runs fast, but I run just as fast.史蒂夫跑的很快，但是我跑的和他一样快。II) Tom has a lot of money, but I don’t have as much.汤姆有很多的钱，而我的钱没有他多。2．用在形容词或者-ed形式的过去分词前，相当于形容词或过去分词作定语，但as仍然保留其原来的词汇意义。e.g. I) In the dead of night I was suddenly wakened by a cry as made by a wolf.在寂静的黑夜里，我突然听到了一声如同狼嚎一样的叫声。II) The old man began to describe the accident as seen through the eyes of a witness.这位老人开始描述这一起事故，如同是一个证人亲眼目睹了一般。四、作as作关系代词，引导定语从句，不仅可以代替一个名词，而且可以代替整个句子或一件事，通常译作 “正如这一点”，“如……一样”。e.g. I) As is known to everybody, the moon travels around the earth once every month.如同大家所知道的一样，月亮每月围绕地球旋转一次。II) As has been said before, grammar is not a set of dead rules.如同以前说过的一样，语法并不是一套死规则。III) Such a clever girl as she can learn anything quickly.像她这样聪明的女孩子学任何东西都很快。IV) It was absolutely bad manners to get into people’s room without knocking, as quite a few young people are doing every day.不敲门就进入别人的房间绝对是不文明的行为，现在很多年轻人每天都这么干。五、as构成的固定词组1．as可以构成介词词组：as against（与……相比）；as compared with（与……对比）；as for / to（至于，关于）；as from / of（自……起）；as a result of（由于……的结果）；as regards（至于）；e.g. I) The output amounts to ten thousand dollars as against eight thousand last year.和去年八千美元的产量相比，今年的产量达到了一万美元。II) There is no doubt as to who will be elected.至于谁会当选，这是毫无疑问的事。III) As a result of your carelessness, the whole project should be put off at least one month.由于你的粗心，整个计划将要被推迟至少一个月。2．as可以构成副词词组：as above（如上）；as a matter of fact（事实上）；as a whole（就整体来说）；as follows（如下）；as good as（和……几乎一样，实际等于）；as such（照其资格，其本身）；such / so … as to（这样的……以至于……）；as yet（尚，至今还）（用于否定句）；as well（也）；e.g. I) As a matter of fact, he didn’t have any interest in the project.事实上，他对这个项目一点兴趣都没有。II) I am not so foolish as to make such a promise.我还没有愚蠢到会许下这样的承诺的地步。III) We are as good as ruined.我们几乎要崩溃了。3．as构成词组作关系代词：as … go（就……一般情况来说）；as it is / was（事实上，按现状）；as it were（好像是）；e.g. I) He is quite good, as boys go. 就一般男孩子而言，他已经很好了。II) I thought conditions would get better, but as it was, they were getting worse.我以为情况会好转，但事实上，却是越来越糟糕。4．as可以构成连词词组：according as（根据，按照……而）；in as (so) far as（根据……程度）；e.g. I) You may go or stay, according as you decide.你可以自己决定是去还是留。II）In as (so) far as we have known about the matter, we can make a decision after the meeting. 就我们对这件事情的了解程度，我们可以在会后作出一个决定。 转载
CHA1LUL1ANG
as只有作副词、介词、连词、代词等四大用法，具体用法如下：
一）as作副词，表示程度，意为“同样地”。在“as．．．as．．．”，“not as．．．as．．．”结构中的第一个as是副词，作“和／与．．．(不)一样”解。eg：Jack is as tall as his father．杰克和他的父亲一样高。
He doesn't speak English as／so fluently as you．他的英语说得不如你流利。二）as作介词。1．作“如，像”解。eg：They got united as one man．他们团结得像一个人一样。2．作“充当，作为”解。eg：As a writer，he was famous．作为作家，他是很有名的。三）as作连词，常用来连接主句和状语从句。1．引导时间状语从句，作“当．．．的时候”解，有“随着．．．”之意，与while意义相近，强调两个动作同时发生；或某事一发生，另一事立即发生。eg：He shouted aloud as her ran along．他一边往前跑，一边高声地呼喊。I was startled as he opened the door．他一开门，我吓了一跳。as作连词，相当于when。eg；As a little boy (When he was a little boy)he began to learn to play piano．他小时候就开始学弹钢琴。2．引导原因状语从句，作“因为，由于”解，与because的用法相近。eg；I must stop writing now，as I have rather a lot of work to do．我必须停笔了，因为我还有许多工作要做。3．引导方式状语从句或比较状语从句，作“正如，(如)像”解。例eg：As in your country，we grow wheat in the north and rice in the south．正如(像)你们国家一样，我们在北方种小麦，在南方种大米。(方式状语从句)When at Rome，do as Romans do．入乡随俗。(方式状语从句)4．引导让步状语从句，作“虽然，尽管”解。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。eg；Strange as it may seem，it is true．尽管这事看上去很奇怪，但却是真的。Try as he might，Tom could not get out of the difficulties．不管怎样努力，汤姆还是摆脱不了困境。四）as作关系代词。1．引导限制性定语从句，用在“such．．．as”,“the same．．．as”，“as．．．as”等结构中，常译作“像．．．一样的人(或物)”，“凡是．．．的人(或物)”。例eg：He wished to be such a man as Lei Feng was．他曾希望做一个像雷锋那样的人。My hometown is no longer the same as it was．我的家乡再也不像过去一样了。2．引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以位于句首、句中或句末。eg：As is well known，oceans cover more than 70％ of the earth．我们知道，海洋占地球面积的百分之七十以上。
LiangJin0727
一、as作连词的用法1. as...as的用法as...as意为"和……一样"，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。其基本结构为：as+ adj./ adv. +as。例如：(1)This film is as interesting as that one.这部电影和那部电影一样有趣。(2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。其否定式为not as/so +adj./ adv. +as。例如：This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。例如：Your bag is twice as expensive as mine.你的袋子比我的贵一倍。几个关于as...as的常见句型：(1)as...as possible Please answer my question as soon as possible.请尽快回答我的问题。(2)as...as usual/beforeShe looks as pretty as before.她看起来和以前一样漂亮。(3)as long as... (引导条件状语从句) It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。(4)as far as He walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火车站。(5)as well as She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。一些带有as...as结构的常见短语归纳：as busy as a bee像蜜蜂一样忙碌as easy as ABC像ABC一样容易as deep as a well像井一样深as light as a feather像羽毛一样轻as soft as butter像黄油一样软as rich as a Jew像犹太人一样富裕2. as用作连词引导时间状语从句as与when，while都是引导时间状语从句的从属连词，含义都是"当……的时候"。但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用as时，主句和从句的动作同时发生，具有延续的含义。例如：(1)It was snowing when he arrived at the construction site.他到达工地时，天正在下雪。(2)He was watching TV while his mother was cooking.他母亲做饭时他在看电视。(3) You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。3. as用作连词引导原因状语从句as，because，since都可以表示因果关系，连接原因状语从句，含义是"因为，由于"，但它们有区别：because表示的语气最强；as一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作"既然"。例如：(1) He will succeed because he is in earnest.他一定会成功，因为他很认真。(2) Since you are so sure of it he”ll believe you.既然你对此如此有把握，他会相信你的。(3) As rain has fallen, the air is cooler.因为下过雨，空气比较清爽。4. as作连词引导让步状语从句as与although (或though)，however (或no matter how)等都可以引导让步状语从句，含义是"虽然，尽管"，但它们有区别：although语气稍正式些，可放在句首，也可放在句中，主句中不能再用but，但可以用yet；as所表示的语气较强，引导的让步状语从句用倒装语序；however引导让步状语从句时，它的后面可跟形容词或副词，也要用倒装语序。例如：(1) Although he is quite old, he still jogs every day.他虽然年纪相当大，仍然每天慢跑。(2) Strange as it may seem, nobody was injured in the accident.这次意外虽然显得令人不可思议，却没有人受伤。(3) However hard he may try, he will not attain his goal.无论他怎样努力也达不到目标。二、as作关系代词的用法关系代词as引导定语从句时，既可以单独使用，也可以与其他词连用，其用法要比that和which更为复杂。1. as引导定语从句与其他词连用①用于the same...as结构中This is the same book as I read last week.这本书和我上周读的那本是一样的。②用于such...as结构中I don”t like such books as he recommends.我不喜欢他推荐的那些书。③用于"so +adj. + a/an + n. (单数) + as "结构中I am not so strong a man as I was.我已经没有从前那么强壮了。2. as单独引导定语从句as单独引导定语从句时，先行词可以是一个词，也可以是一个句子或短语。例如：(1) She is late, as is often the case.她迟到了，这是经常的事。(先行词是整个主句)(2) To shut your eyes to facts, as many of you do, is foolish.对事实视而不见--你们好多人都是如此的愚蠢。(先行词是不定式短语)三、as作介词的用法as作介词，意思是"作为"，"以……身份"。例如：He came to China as a tourist five years ago.他五年前以游客的身份来过中国。四、as作副词的用法to the same degree or amount; equally "相同地"，"同样地"。例如：They don”t have as many airplanes.他们没有同样多的飞机。
hailanlan75
as的用法归纳总结：as作为介词时，用法和语义较单一，其含义为“作为”。但是as作为连词词性时，其用法和功能较多，可以引导各类从句，as引导原因状语从句、时间状语从句、方式状语从句、让步状语从句和定语从句。
as的用法
1、as做介词，意思是“作为”
例句：
French is known as the most beautiful language in the world.
法语以世界上最美丽的语言著称。
2、as做连词，引导时间状语从句，意思是“当……的时候”
例句：
My mother was cooking fish as I arrived home.
当我到家的时候，我妈妈正在做鱼。
3、as做连词，引导原因状语从句，意思是“因为”
例句：
As rain has fallen, the air is cooler.
因为下过雨，所以空气比较凉爽。
4、as做连词，引导让步状语从句，意思是“虽然”
例句：
Young as he is, he has been one of the most famous painters in our country.
虽然他还很年轻，但已经成为我们国家最有名的画家之一。
5、as做连词，引导方式状语从句，意思是“以……方式”
例句：
Do as the Romans do when in Rome.
入乡随俗
6、as做关系代词，引导定语从句
例句：
This is the same game as I played yesterday.
这和我昨天玩的游戏一样。
