今天和大家一起学习一下as的用法，快来一起学习吧，下面小编就和大家分享，来欣赏一下吧 。
【新概念】as的用法小结
as可以作连词、介词及关系代词 。现将其用法小结如下:
一、 as作连词的用法:
1. 作"当……的时候",引导时间状语从句 。注意与when、 while的用法区别 。
① when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间 。如:
When he was at college, he could speak several foreign languages. (表示一段时间)
When the clock struck twelve, all the lights in the street ***t out. (表示时刻)
② 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 。如:
Work while you work. Play while you play.
③ 但属下列情形时,只用as, 而不用when或while 。
A) 用于表示同一个人的两种动作交替进行,指"一边……,一边……" 。如:
The girl dances as she sings on the stage.
He looked behind from time to time// as he ***t forward.
B)表示两个同步发展的动作或行为,译为"随着……" 。如:
As time ***t on / by, she became more and more worried.
As children get older, they become more and more interested in the things around them.
C)表示两个短促行为或事件几乎同时发生 。如:
I thought of it //just as you opened your mouth.
Just as the flying worm hit her face, she gave a loud cry.
D) 后接名词表示某一年龄段时,用as 。如:
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 。如:
As / Since you're not feeling well, you may stay at home.
As he wasn't ready in time, we ***t without him.
3. as=in the way that, 作"像"、"按照……的方式"解,引导方式状语从句 。如:
He speaks English as Americans do.
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(副词后面跟形容词、动词、副词),后一个as是连词(连词后面可以跟动词、形容词、句子),引导比较状语从句 。如:
They helped the old man as often as possible.
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 。如:
Tired as they were, they walked on.
Child as he is, he knows a lot. (child前不用冠词)
二、 as作关系代词,引导定语从句,作"正如"、"这一点"解 。如:
He is very careful, as his work shows.
As is well-known, Taiwan belongs to China.
另外,当先行词被the same, such等词修饰时,常用as来引导定语从句 。如:
Such a clever boy as he can learn anything quickly.
I was reading the same book as he bought yesterday.
三、 as作介词的用法:
as引导的介词短语大多用作状语,as译为"作为";少数情况可引起宾语补足语 。如:
As a League member, I'll take the lead in everything. (状语)
She works as a doctor. (状语)
They have me as one of their own children.(引起宾语补足语)
【英语】分析长难句必备语法点：as用法总结
as主要词性
as 主要有两种词性，分别为介词和连词 ， 并且出现在as...as...这样的固定结构中 。as作为介词时，常与一些动词搭配使用，比如view... as... (把……当作) ， regard... as...(把……当作) refer to...as...(把……称作) ，use...as (把……用作) 。
真题例如：Many consumers seem to have been influenced by stock-market swings, which investors now view as a necessary ingredient to a sustained boom. (2004年Text 3)
这里的as结构是view... as...，view的宾语是关系代词which，它指代前面的先行词stock-market swings，这句话翻译为：许多消费者已经受到股票市场波动的影响，而投资者们正在将这些波动视为经济长期繁荣必要因素 。
as作为连词词性时，可以引导各类从句 。
as 引导定语从句
as引导定语从句时 ， 既可以引导限制性定语从句 ， 又可以引导非限制性定语从句 。as引导限制性定语从句可见于such...as结构中，可代替先行词或物的名词 。如Let’s discuss only such problems as concern us.让我们只讨论与我们有关的问题 。as还可引导非限制性定语从句，代替整个主句，对其进行说明 。如As might be expected, the response to the question was very mixed. As代替后面的主句，在从句中做主语 。正如所料，人们对于这个问题的观点不一 。
as引导让步状语从句
as引导让步状语从句, 此时相当于although，意思是虽然，尽管 。as引导的让步状语从句一律采取倒装形式 。如Angry as he was, he couldn’t help smiling.尽管他很生气，但他还是忍不住笑了 。
真题例句：Symbolic of national unity as they claim to be, their very history-and sometimes the way they behave today-embodies outdated and indefensible privileges and inequalities.(2015年Text 1)
前半句话是由as引导的让步状语从句，是部分倒装结构，正常语序为as they claim to be symbolic of national unity ， 修饰主句 。
译文：尽管他们宣称自己代表着国家统一，但是正是他们以往的历史以及现在有时的行为方式体现了已经过时的、站不住脚的特权和不公平 。
as引导时间状语从句
as引导时间状语从句，可以翻译成“当……时候;随着……”如He gets more attractive as he gets older. 随着年龄的增长 ， 他变得愈发有魅力 。
真题例句：
Now utopia has grown unfashionable, as we have gained a deeper appreciation of the range of threats facing us, from asteroid strike to epidemic flu and to climate change.(2013年Text 3)
译文：现如今这种空想的美好社会已经过时了，我们对面临的威胁范围有了更深刻的认识，从彗星撞击到流行感冒，再到气候变化 。
as引导原因状语从句
as引导原因状语从句，表示的是双方都知道的原因 。可翻译成既然 ， 由于 。如As it was getting late, I decided to book into a hotel.因为天色已晚，我决定找间饭店投宿 。
as引导的方式状语从句
as表示按照，以……方式，像……一样，正如 。如Careful surveys have indicated that as many as 50 percent of patients do not take drugs as directed.这里的as是以……方式，按照 。这句话翻译为仔细的调查表明 ， 多达50%的病人未按规定服药 。
as引导的比较状语从句
as引导比较状语从句，其基本结构是as…as 。前一个as是副词 ， 后一个as是比较状语从句的连词 。如It’s not as good as it used to be.这个不如以前的好 。
高中英语语法知识点：as...as...用法小结
as...as...用法小结
(1)...as+形容词(副词)原级+as...;not as/so+形容词(副词)原级+as...
Their factory is as large as ours.他们的工厂和我们的一样大 。
I study as hard as you.我和你一样用功学习 。
【as的用法小结(精华版 as的用法小结)】He doesn’t get up as/ so early as his parents.他不像他父母那样早起床 。
(2)……倍数+ as + 形容词(副词)原级+as...
Line AB is 3 times as long as Line CD.=Line AB is twice longer than/3 times the length of Line CD.线段AB是线段CD长的3倍 。
(3)as + 形容词+ a/an + 单数可数名词+ as; as + 形容词+复数名词+ as
She is as good many records as possible.我们需要尽量多的唱片 。
There is as much sugar in it as eight pieces of sugar.其中的含糖量相当于八块方糖 。
I have’t got as much money as I thought.我没有原来想象的那么多钱 。
(4)as/so long as 只要;如果
You may use that dictionary as long as you take care of it.只要你好好保存，你可以用那本词典 。
as a matter of fact=in fact事实上、实际上……
It seems easy,but as a matter of fact,it’ll take us a long time to work it out.
这道题貌似简单 ， 实际上要解出的话很费时间 。
(5)as much/ many as多达……，……那么多
On Sports Day, during the relay race, you will use most of all, perhaps as much as 650 calories an hour.在运动会上，进行接力赛跑时，你消耗的能量最多，可能每小时多达650卡 。
As many as 700 different languages are spoken in Africa.非洲有多达700种不同的语言 。
He didn’t catch as many as he’d hoped.他没有捉住预想的那么多 。
(6)as...as possible; as... as one can
The teacher should write the words on the blackboard as carefully as he can. =The teacher should write the words on the blackboard as carefully as possible.老师在黑板上应尽可能仔细地把字写好 。
Please be as friendly as possible to your friends.=Please be as friendly as you can.请对你的朋友尽可能友好 。
(7)as...as + 年代数字/名词
As early as 1950 I knew him.早在1950 年我就认识他了 。
He walked as far as the post office.他步行到邮局 。
(8)as/so far as I know
As/ So for as I know, he will be away from home for 3 months.就我所知，他将要离家3个月 。
(9)as soon as—……就……
Please let us know as soon as you arrive in Bejing.一到北京，请通知我们一声 。
(10)as well as 和;也;还有
He gave me money as well as advice.他除了给我忠告外，还给我钱 。
He studies French as well as English.他不但学习英语，而且学习法语 。
区别下列用法
1)as(so)far as 和……一样远，远至(原级比较或表示距离);就……来讲
2)as(so)long as 和……一样长(原级比较);只要(引导条件状语从句)
3)as well as和……一样好;既……也……(连接并列成分)
4)as good as和……一样好;事实上(作状语)
as if可用as though替换 ， 在此引导表语从句，另外它们也可引导状语从句，从句既可用陈述语气，也可用虚拟语气 。如：
①It looks as if /though it’s going to rain.(陈述语气)
②You look as if you’d seen a ghost.(虚拟语气)
as is the case with = as with ……就和……的情况一样
As is the case with his mother, he is fond of music. 跟母亲一样 ， 他喜欢音乐 。
As with human, animals also love their babies. 同人一样 ， 动物也爱它们的幼仔 。
as good as
as good as 作为固定词组意为“几乎一样”，“实际上等于”，作为同级比较结构，意为“和……一样好” 。如：
①He is as good at English as me.②My bike is as good as yours.
…as it is
该固定词组表达意思是“就以(现在)这个样子 ， ”“根据现在的情况” 。
如：He decided to buy the house as it is.
as long as/so long as只要
(1)引导条件状语从句
You may borrow the book as / so long as you keep it clean. 只要你不把书弄脏，你就可以借 。
You will succeed so long as you work hard. 只要你努力就会成功 。
As long as you study hard, you’ll make great progress. 只要你努力学习，你就会取得很大进步 。
(2)和……一样长
This rope is as long as that one.这条绳子和那条一样长 。
This bridge isn’t so/as long as that one.这座桥和那座不一样长 。
(3)长达……(表时间)
The old couple have been living in the small town as long as 50 years.这对老夫妇已在这个小城镇里住了长达50年 。
as well/ as well as
as well 表示“也”，是副词短语，用作状语，通常放在句末，也可放在主语之后，相当于too,但一般无标点符号与句子隔开.as well as 通常看作一个复合并列连词,连接两个成分相同的词、短语或句子，表示“既……又……，不但……而且……”当它连接两个主语时，谓语动词的人称和数要与第一个主语保持一致 。如：
The children learn to read, write and they play games as well.孩子们学习读书写字，他们也做游戏 。
With television,we can see a picture as well as hear sound.利用电视,我们既能听到声音,又能看到图像.
Tom,as well as his parents,likes pop music.汤姆以及他的父母都喜欢流行音乐 。
不起眼单词的超大用途，as的用法全解析
、介词as
1.好像
They entered the building disguised as cleaners.
他们伪装成清洁工进入了大楼 。
2.作为;当作
I respect him as a writer and as a man.
我尊重他这位作家，也尊重他这个人 。
二、副词as
1.与……等同;和……一样 。用于句型as……as ，
This dress is twice as expensive as that.
这件裙子比那件贵一倍 。
He recited as much of the poem as he could remember.
他把诗中记得住的都背了出来 。
2.像;如
As before he remained unmoved.
他像往常一样无动于衷 。
三、连词as
1.在……期间;当……时
As he grew older, he lost interest in everything, except gardening.
随着年纪越来越大，他对一切都失去了兴趣，除了园艺 。
2.因为
As he's been ill perhaps she;ll need some help.
她由于生病可能需要些帮助 。
3.尽管;虽然
Young as I am, I already know what career I want to follow.
我虽然还?。?可是对想要从事的职业早已胸有成竹了 。
4.以……的方式;按照
Why didn't you catch the last bus as I told you to?
你怎么不听我的话赶上末班车呢?
5.为……之事实;正如
Cyprus, as you know, is an island in the Mediterranean.
如你所知，塞浦路斯是地中海的一个岛国 。
6.也一样(通常后接be或do+主语)
He's a doctor, as was his wife before she had children.
他是医生，他妻子生孩子之前也当过医生 。
四、固定搭配
1.as for sb.至于
As for the hotel, it was very uncomfortable and miles from the sea.
至于旅馆呢，非常不舒服，而且离海边还远 。
2.as to sb./ sth.至于
As to correcting our homework, the teacher always makes us do it ourselves.
谈到批改我们的作业，老师总是让我们自己改 。
3.as if / though 似乎;好像
He behaved as if nothing had happened.
他装作若无其事的样子 。
4.as it is 照现状看;看样子
We were ho**** to have a holiday next week, as it is, we may not be able to get away.
我们原本盼望着下周放假，看样子走不了了 。
五、辨析
1.when / while / as
三者都可以引导时间状语从句，翻译成“当……时” 。大多数情况下都可以互换 。when没有具体要求 ， 时间点和时间段都可以;while只能用于时间段;as更多了一个“随着”的意思，可以表达“一边……一边……” 。
When my mother came into the house, she found me lying there awake.
当妈妈走进家门时，发现我正在那睁着眼躺着 。
While we were talking happily, the teacher came in.
我们正谈着开心 ， 老师走了进来 。
The little girl sang as she ***t.
这个小女孩边走边唱 。
2.because / for / since / as
这几个都接从句，表示因为 ， 具体区别可以参照之前的文章提到“因为”只知道because?盘点其他不熟悉的表达方式 ， 助力写作
3.although / as
这两个都可以引导让步状语从句，但是as要进行倒装 。
Although he is young, he knows a lot.
=Young as he is, he knows a lot.
虽然他很小，但是他知道的很多 。
4.as for / as to
两者都可以表示“至于” 。as for 更倾向于比较性 ， 两者有一定的对比 。有时可以包含说话人的一种轻蔑、冷淡、不屑、甚至是厌恶之感;as to更倾向于客观陈述，谈话的内容大家都有所了解 。
You can have a bed; as for him, he'll have to sleep on the floor.
你可以有张床，至于他嘛，打地铺去吧 。
As to your ability to overfulfil the target, I never had the slightest doubt.
关于你超额完成目标的能力 ， 我从未怀疑过 。
好了，今天就先聊这些吧，现在终于是把as完全弄清楚了 。
as的用法小结
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