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高中英语语法介绍：as as的用法
语法知识首先理论性较强，学生只有充分理解这些相应的语言点，弄清楚语法的原理，才可能真正掌握这些内容。下面是小编为大家收集的高中英语语法介绍：as as的用法，供大家参考借鉴，希望可以帮助到有需要的朋友。
as as 结构在英语中用法较多，学生在平时的学习中会频繁地接触到此种结构。有部分学生认为 as as 结构中只能出现形容词或副词并且认为此结构只能用于原级比较，这种认识是单一的。实际上 as as 结构经过不同变化可以构成不同的短语和句式，这些短语和句式被灵活地运用于课文和练习中。如果学生对此结构的用法了解不多，就会在平时的学习中遇到障碍。为了帮助学生清除障碍，笔者就 as as 结构的几种用法介绍如下：
一、as + 形容词或副词原级 + as 意为和一样，表示同级的比较，但要注意第一个 as 为副词，第二个 as 为连词。根据比较对象和性质的不同又可以把此种结构分为三种：
（一） as as 结构用于表示不同人或物同一性质的比较，意为和一样 。例如：
The tree is as tall as the building(is) .
这棵树和那栋楼一样高。
注意此结构也常用于形象比喻中： as cool as cucumber 沉着的， as stubborn as a mule 非常顽强的，倔强的， as clear as crystal 非常透明的， as poor as a church mouse 非常贫困的， 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。这些短语生动活泼，浅显易懂，记住这些短语可以提高学生的英语写作和口语能力。
（二）“ as … as …结构”用于表示同一个人或物不同性质的比较，意为“既……又……” 。例如：
This swimming pool is as wide as it is long.这个游泳池宽度和长度相等。
（三）“ as … as …结构”用于表示两个人或物不同性质的比较，表示程度相同或相当，意为“……而……”。在否定句中结构是“ so/as…as… ”。例如：
He was as handsome as his wife was beautiful .他长得非常英俊，他的妻子也长得非常漂亮。
He was as experienced as his brother was green .
他经验丰富，而他兄弟却涉世未深。
He cannot run so/as fast as you.他没你跑得快。
Danny is not so/as wise as he is witty .
丹尼为人风趣，但欠明智。
需要注意的是： “as + 形容词或副词原级 + as…” 结构的变体形式是“ as + 形容词 + a + 单数名词 + as 或 as + many/much + 名词 + as ”。意为“……和……一样…… " 。例如：
I dont want as expensive a car as this.＝ I dont want a car as expensive as this .
我不要这么贵的汽车。
This is as good an example as the other is.这个例子和另外一个例子一样好。
Tony is as clever a boy as his brother .
托尼是一个和他兄弟一样聪明的男孩。
I can carry as much paper as you can.我能搬得动和你一样多的纸。
此外，变体结构的否定形式为“ so +adj.+ a/an + n.( 单数 ) + as " 。例如：
I am not so strong a man as I was.我已经没有从前那么强壮了。
二、 “as … as… 结构 ” 中常见词组和句式的用法
“as … as… 结构 ” 中常见词组和句式有很多，最常见的词组有“ as soon as ”意思是 " 一 …… 就 ……", 引导一个时间状语从句，还有“ as much as ”和“ as many as ”意思是“像 …… 一样多 ……” ，用来表达极其多的语气，学生在学习中时常会遇到这些词组，对这些词组的用法并不陌生。笔者对此无需赘述。下列笔者将要介绍 “as … as… 结构 ” 中其他一些常用词组和句式：
（一）词组“ as long as ”意思是 " 长达 …… 之久；只要 ……" 。引导时间或条件状语从句。如：
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。
You may borrow this book as long as you promise to give it back.只要你答应归还，你就可以把这书借走。
As long as you work hard, you are sure to succeed in everything.只要你努力，你就一定会事事成功。
（二）词组“ as far as ” 意思是“那么远，就… … 而知，就… … 言，” 如：
He walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火车站。
As far as I’m concerned, she is the most qualified for the job.在我看来，她是最适合这份工作的。
（三）句式 “ as+ many/much+ 名词 +as” 意思是“ …… 和 …… 一样”。此结构是词组“ as much as ”和“ as many as ”的变体形式。如：
To eat too much is as much a bad thing as to eat nothing.吃太多和什么都不吃同样是坏事。
He is as much a member of the orchestra as Tom.他和汤姆同样是管弦乐队的成员。
Comets are just as much members of the sun’s family as(are) the other planets.彗星和其他的行星同样是太阳家族的成员。
（四）以下几个结构的意思都差不多：“ as … as possible/as…as one can(could)/as…as…can be” 都表示“尽可能地… … ”的意思。 如：
Read the story as quickly as possible.= Read the story as quickly as you can.尽快地阅读这篇故事。
They watered the trees as often as possible.= They watered the trees as often as they could.他们尽可能经常给树浇水。
His failure is as plain as plain can be.他的失败是再明白不过了。
He is as handsome as handsome can be.他潇洒极了。
Mary is as hardworking as can be.玛丽学习极为努力。
其他例如：
as wise as wise can be 再聪明不过了 as white as white can be 白得不能再白了 as wrong as wrong can be 错得太离谱了
（五）“ as … as usual/ever/before ”此结构的意思是“像平时 / 以前一样”。如：
He gets up as early as usual.他像平时一样早起。
He seems to be as busy as ever.他似乎像往常一样忙碌。
He works as hard as ever.他和往常一样努力工作。
She was as beautiful as ever after so many years.过了这么多年她美丽如故。
（六）“ as … as …结构”可以用来表示倍数。具体用法是倍数词： twice ， three times ， half 或 a quarter 置于第一个 as 之前，意思是“ …… 是 …… 的几倍”。如：You are not half as clever as you think you are .
你可不像自己想象的那么聪明。
She isn ’ t going out with a man who is twice as old as she .她不打算和一个比她大一倍的人出去散步。
We’ve produced twice as much cotton this year as we did last year.我们今年的棉花产量是去年的两倍。
She works three times as hard as I.她用功的程度是我的三倍。
需要注意的是，在比较级前还可以用“ over, more than ” 等表示“比 …… 倍数还要多”。如：He is more than three times as rich as I.他的财富是我的三倍还不止。
I am more than twice as old as he.我的年龄是他是两倍还不止。
He studies more than three times as hard as I.他用功的程度是我的三倍还不止。
He has collected more than four times as many stamps as I.他搜集的邮票是我的四倍还不止。
（七）词组“ as well as ”意思是“像…一样好，既…又… , 除之外还”，此短语使用频率十分高，用途非常广泛。它可以用作连词和介词，也可以表示比较。具体用法如下：
1.词组“ as well as ”用作连词。连接两个并列的同等成分，其意义为“不但……而且……”，“既……又……”，这时相当于“ not only … but also… ”。它所连接的部分既可以是单词、短语，也可以是句子。例如：He speaks Japanese as well as English and French.他不但讲英语和法语，而且还讲日语。
2.词组“ as well as ”用作介词。此时，相当于 besides ，意为“除……之外”，后常接名词、动名词。如As well as visiting the old man, he helped to clean the room.除看望老人外，他还帮助打扫房间。
3.“ as well as ”用于同级比较 , 意为“和……一样（好）”，这时，第一个 as 是副词，第二个 as 是连词，引导一个状语从句，表示同级比较。如：
He can operate the machine as well as I do.他操作这台机器和我一样熟练。
4.在使用“ as well as ” 时还应注意以下几点：
（ 1 ）当“ as well as ” 连接主语时，谓语动词的人称和数应与“ as well as ” 之前的名词或代词的人称和数保持一致。如：
Mary as well as I has been to the Great Wall.我和玛丽去过长城。
（ 2 ）当“ as well as ”连接两个谓语动词时，前后时态与形式应保持一致。如：They play the piano as well as sing.他们不但会唱歌，而且会弹琴。
（ 3 ）当“ as well as ”连接两个简单动词时，也可充当插入语，这时 as well as 后的动词在人称和数上应与主语保持一致。如：He works, as well as sleeps, in the room.他既在这房间里睡觉，又在这儿工作。
（ 4 ）当“ as well as ”前的动词是分词或不定式，那么“ as well as ” 后的动词应取相应的形式（不定式不带 to ）。如：You can’t expect her to do the housework as well as look after the children.你不可能叫她既做家务又照看小孩。
（ 5 ）如果“ as well as ”前的谓语动词是一般现在时或一般过去时，“ as well as ” 之后的动词可与前面一致，也可用动名词形式。如：She sings as well as playing the piano.她不但会弹琴，而且会唱歌。
Heavy smoking runs away with your money, as well as being bad for your health.抽烟多既浪费金钱，又对健康不利。
（ 6 ）如果“ as well as ” 前面的动词是分词，那么“ as well as ” 后的动词也应用分词形式。如： We are repairing the roof, as well as painting the walls.我们既油漆墙壁，又修房顶。
（ 7 ） “ as well as ”也可以用于否定结构中，当 not 位于“ as well as ” 后时，两者都否定；当 not 用于 as well as 前时，否定前者，肯定后者。试比较：
I shall not see the film as well as he.他将去看电影，而我不去。
I, as well as he, shall not see the film.他不去看电影，我也不去。
通过以上分析可以发现“ as … as …结构”看似简单，但此结构变化太多，不易掌握。只有在平时的学习中多做练习才能熟能生巧。
As… as 的否定形式： not as … as
Not as half … as …
My daughter is not as half clever as your daughter.
拓展：
定语从句as的用法
一、用作连词的as
1.引导时间状语从句，表示“当……的时候”，其用法与when和while类似。例如：As a child (When he was a child), she was sent to six different schools.此用法中as多表示从句与主句动作同时进行，意为“一边……一边……”，一般不与状态动词连用。例如：She sang songs as she did her homework.
as 还可以表示一动作紧接着另一动作发生，说明另一动作的结果，有“随着……”的含义。例如：As time went by, we found he was an honest man./As he grew older, he lost interest in everything except gardening.
例1 It wasn’t until nearly a month later________ I received the manager’s reply.
A.since B.when C.as D.that
解析：本题的as中与when一起作为干扰项，容易使考生往时间状语从句上思考，事实上本题是强调句，正确选项是D。
2.引导原因状语从句，表示“由于，因为”，相当于because, 但通常置于句首。例如： As he is a qualified doctor, I trust his advice on medical matters.
例2 _____ modeling business is by no means easy to get into, the good model will always be in demand.
A.While B.Since C.As D.If
解析：本题中as干扰性很强，很多考生误以为是原因状语从句，但仔细分析不难发现正确答案应是A(while表示“只要”)。
3.引导让步状语从句，通常可与although或though通用，但语序不同，although或though用于句首，as用于倒装结构。例如：Young as I am, I already know what career I want to follow./Although(或Though)I am young, I already know what career I want to follow.as 表示让步用于倒装结构，通常将从句的表语、状语或动词前置。如果表语有冠词a/an, 需去掉。例如：Great scholar as he is, he is lacking in common sense./Much as I like you, I couldn’t live with you.例3 _____ he has limited technical knowledge, the older worker has a lot of experience.
A.SinceB.Unless C.As D.Although
解析：as 虽然有引导让步状语从句用法，但本题不是倒装结构，故正确答案应是D。
4.引导方式状语从句，表示“如，像”。例如：When in Rome, do as Romans do./Do to others as you would have others do to you.
例4 We wanted to get home before dark, but it didn’t quite ________ as planned.
A.make outB.turn out C.go onD.come up
解析：本题考查动词词组辨析，题干中的“as planned”给同学们提供了重要信息，答案选B。
5.固定句型：“主句，as +be/do+主语”表示“也一样”。例如：She’s unusually tall, as are both her parents./He’s a doctor, as was his wife before she had children.
二、用作介词的as
1.表示“如，像”。例如：They got united as one man./She spoke of me as her dearest friend.
2.表示“作为、当作”。例如：As a League member, you should think more of others.
3.与某些动词搭配，表示“把……当作……”，如：look on…as…, regard…as…, treat…as…, consider…as…, think of…as…, see…as…等。其中consider…as…中的as可以省略。as与famous或known搭配，表示“作为……而出名”。
例5 Linda worked for the Minnesota Manufacturing and Mining Company, ________ as 3M.
A.knowingB.known C.being knownD.to be known
解析：如果熟悉be known as这一短语，运用有关非谓语动词的常识，可选出正确答案B。
三、用作关系代词的as
1.引导限制性定语从句，先行词前通常有as, so, such, same等修饰语。例如：He will marry as pretty a girl as he can find./My hometown is no longer the same as it used to be./As many people as are present will be given a present.在此种用法中，同学们要注意与结果状语从句的区别。比如：A: The teacher asked us such a difficult question that none of us could answer it.B: The teacher asked us such a difficult question as none of us could answer.A句为结果状语从句，而B句则是定语从句。
2.引导非限制性定语从句，用来指代整个主句(即先行句)，表示“这一事实，那一情况”。从句可以位于句首、句中或句末。例如：We stand when the national anthem is played, as is the custom.
例6 ______ I explained on the telephone, your request will be considered at the next meeting.
A.When B.After C.As D.Since
解析：根据句意，选项C是正确答案。as表现的正是本点所讲用法。
四、用作副词的as
修饰形容词或副词，表示程度，意为“同样地”。例如：He swims fast, but I swim just as fast.但它通常构成表示比较的结构“asas”，“not asas”。此结构中第一个as是副词，第二个as是连词。否定结构中的副词as可以由so代替。asas possible /one can也属于此用法。例如：It is generally believed that teaching is as much an art as it is a science.
五、用在习语中的as
由as构成的习语很多，常见的有：as soon as “一就”，引导时间状语从句;as/so long as “只要”引导条件状语从句;as if/though “好像，仿佛”，引导方式状语从句或表语从句;as to/ as for “至于，就而言”;as much/many as“多达”;as/so far as “就的限度”;as a result，as a result of “(由于的)结果”;as a matter of fact“事实上”;as well “也、还”;A as well as B“不但A而且B”;as it is“照现状看，看样子”，等等。这些习语在高考中可能经常遇到，在高考题中有的作为正确选项，有的作为干扰项，有的出现在题干，值得同学们认真掌握。例如：
例9 I would like a job which pays more, but ______ I enjoy the work I’m doing at the moment.
A.in other wordsB.on the other hand C.for one thing D.as a matter of fact 解析：选项D极具干扰意义，但进一步研读会发现本题中的两个分句表达了一件事的两个对立面，故选B。
例10 ——People should stop using their cars and start using public transport.——______.The roads are too crowded as it is.
A.All right B.Exactly C.Go aheadD.Fine
解析：本题选项中虽没有as内容，但题干中的as it is却是解题的关键信息，正确选项为B。
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