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单词as词形简单，但用法复杂，可作副词、替代词、关系代词、从属连词和介词。还可与其他词汇结合构成诸多搭配，故as一直是高考热点，也是广大考生复习备考的难点。现结合考题，剖析难点，以飨读者。
一、用作介词，as与like用法区别
[例1] Let’s learn to use the problem we are facing ______ a stepping-stone to future succe.(NMET 2008全国卷)A.to B.for C.as D.by [解析] C。as作介词表“作为”，常接在treat/regard/recognize/use等动词之后；而like表“像„„一样”。试比较：
(1)He is a child, and must be treated as such.他年幼，应该当孩子对待。(2)He acted like a child, while he had grown up.他虽已成人，但做事却像孩子一样。
二、用作从属连词
1．表时间，as/when/while用法区别
[例2] Mother was worried because little Alice was ill, especially ______ Father was away in France.(NMET 1994全国卷)A.as B.that C.during D.if [解析] A。主从句动作先后发生常用when；两个较长动作同时发生用while；特别强调主从句动作同时发生用as，译作“一边„„一边”，as还可表“随着”。另when, while还可用作并列连词。when表at that time，而while表“两相对照”。
2．表原因，as/because/since/for用法区别
[例3] Jenny was very sad over the lo of the photos she had shot at Canada, ______ this was a memory she especially treasured.(NMET 2006广东卷)A.as B.if C.when D.where [解析]A。as 作从属连词引导原因状语从句。as和because, since, for的区别是：because语势最强，用来说明人所未知的原因，回答why提出的问题，可置于强调句中且其前可加修饰语； since是双方都知晓原因或经过分析而得之的原因，语气次之；for是并列连词，前用逗号隔开，表逻辑推理或补充说明；as语气最弱，原因是显而易见的或已为人们所知，即已知原因，所引导的分句可置于句首。
3．表转折，引导让步状语从句[来源:学科网ZXXK]
[例4] ______, he talks a lot about his favorite singers after cla.(NMET 2005重庆卷）
A.A quiet student as he may be B.Quiet student as he may be C.Be a quiet student as he may D.Quiet as he may be a student [解析] B。as 引导让步状语从句时，形容词、副词、动词等常置前；若表语为名词，前置时使用零冠词；从句谓语动词常和助动词或情态动词may, might, will, would等连用。
4．表正如，引导方式状语从句
[例5] —Who should be responsible for the accident? —The bo, not the workers.They just carried out the order ______.(NMET 2008福建卷)A.as told B.as are told C.as telling D.as they told [解析]A。as引导方式状语从句，表按照、正如；非限定分句“从属连词+-ed/-ing形式” 可以看作是一种省略，即省略了主语和be动词。究竟使用何种非谓语动词形式取决于主被动关系。又如：
(1)As I explained on the phone, your request will be considered at the next meeting.（NMET 2005浙江卷）
(2)Doctors have said that as many as 40 percent of patients don’t take medicine as directed.三、用作关系代词，指代整个句子，as/which/it用法区别
[例6] The Beatles, ______ many of you are old enough to remember, came from Liverpool.(NMET 2006天津卷)A.what B.that C.how D.as [解析] D。as作关系代词，在非限制性定语从句中，可指代整个句子内容，置于句首，而which不可；it为代词，用作句子成分，但不用来连接句子，故常和并列连词连用；在限制性定语从句中常与such, the same连用，试比较：[来源:Zxxk.Com]
(1)I haven’t many toys but I will send you such as I have.我的玩具并不多。不过，我会把我仅有的一点玩具送给你。
(2)The book is not such that I can advise you to read it.这本书并不怎么样，我没法向你推介。
四、用作从句性替代词，等同于so
[例7] —My room gets very cold at night.—______.(NMET 2007江苏卷)A.So is mine B.So mine is C.So does mine D.So mine does [解析]C。从题干中动词gets得知，助动词应选择do的适当形式，故排除选项A和B；从语序上考虑，排除选项D。as用作从句性替代词，等同于so，只是用于正式语体中。如：Our eating habits have changed, as has our way of life.五、as„as结构
1．构成倍数比较句型：n times+as„as
[例8] What a table!I’ ve never seen such a thing before.It is ______ it is long.（NMET 2005湖北卷）
A.half not as wide as B.wide not as half as C.not half as wide as D.as wide as not half [解析]答案C。not与谓语动词连用构成否定。as 作从属连词引导比较状语从句，常见结构为as...as，第一个as为副词，后接形容词或副词，第二个as为连词。程度修饰语应放在第一个as之前。
2.as/so long as
[例9] —Have you got any idea for the summer vacation?[来源:学&科&网] —I don’t mind where we go ______ there’s sun, sea and beach.(NMET 2008全国卷)A.as if B.as long as C.now that D.in order that [解析] B。as long as最基本词义表示主从句动作延续时间一样长，可引导时间状语从句；若引导条件状语从句，表“只要”，同only if，为唯一条件。又如：
As long as I know the money is safe, I shall not worry about it.（NMET 2003北京卷）
3.as far as
[例10] ______ I can see, there is only one poible way to keep away from the danger.（NMET 2004北京春季卷）
A.As long as B.As far as C.Just as D.Even if [解析] B。as far as I knowcan seeam concerned表据我所知（我看、我所关心的）；as far as还表“远至”。
4.as much as
[例11] The more I think about him, the more reasons I find for loving him ______ I did.（NMET 2005湖南卷）
A.as much as B.as long as C.as soon as D.as far as [解析]A。as much as表程度或数量；as long as表长度或条件；as soon as尽快；as far as远至，根据。若用于否定句中，第一个as换为so。例：Young people in the US don’t care so much about fashion as those in China.5.as well as
[例12] John plays football ______, David.(NMET 1994全国卷)A.as well B.as well as C.so well D.so well as [解析]B。if not better than为插入语，对考生答题具有一定干扰。as well as在功能上相当于并列连词，用来连接两个平行成分，但不能用作并列连词。注意在连接两个并列谓语动词时，其后的动词使用动词-ing形式；除此之外，所连接的成分前后应保持平行、对等。试比较：
⑴ Computers have been put into robots and _____to make mobile phones as well as _______with medical operations.(原创模拟)A.used;to help B.used;help C.using;helping D.using;helped ⑵ Computers have been put into robots as well as _____to make mobile phones and _______with medical operations.(原创模拟)[来源:Zxxk.Com]
A.used;to help B.having been used;help C.being used;helping D.using;helped 答案与解析：⑴B；⑵B。⑴中and为并列连词，used与谓语动词put保持一致。as well as用来连接两个并列状语，作不定式的宾语，故make与help保持一致；⑵中as well as用来连接两个并列动词，故紧随其后的动词使用-ing形式，并与谓语动词照应，使用having been used形式。其后and为并列连词，连接并列状语，作不定式的宾语，保持一致。
6.as good as
[例13] He said he would do whatever he could to help me, and he was ______ his word.A.as good as B.as well as C.as much as D.as many as [解析]A。as good as最基本词义是“和„„一样好”；还可表示“几乎，简直是”，其后接名词、动词或形容词均可，在功能上相当于副词very nearly。如：
⑴The work is as good as finished.工作基本完成。
⑵If he finds out, I’m as good as dead.要是他发现了，我就完了。
六、as其他常见搭配 1．so as to
[例14] All these gifts must be mailed immediately ______ in time for Christmas.（NMET 2005辽宁卷）
A.in order to have received B.in order to receive C.so as to be received D.so as to be receiving [解析] C。so+(adj./adv.)as to do既表目的又可表结果，在表目的时可以和in order to换用但不可置于句首。so后接形容词或副词时只表结果。此题结合时态和语态对考生进行综合考查。试比较：
[例15] My English teacher’s humor was ______ make every student burst into laughter.(NMET 2008江西卷)A.so as to B.such as to C.such that D.so that [解析]B。从题干动词make可以看出，选项C和D应排除，sosuch that为从属连词，后接从句；此处such 为代词，表这样的人或物，作表语，后续不定式表
结果，其前加as to以示强调。试比较：My English teacher’s humor was such that makes every student burst into laughter.[来源:学科网ZXXK][来源:Z_xx_k.Com] 2．as against/for/to/with
[例16] ______ pandas, golden monkeys are in danger of dying out in our country.A.As against B.As for C.As to D.As with [解析] D。此题考查as的常见搭配。as against与„„相对；as for somebodysomething就„„而言；as to(依照一定的标准或原则)根据、依照；as with和„„一样。
3.as if/though
[例17] Elize remembers everything exactly as if it ______ yesterday.(NMET 2006全国卷)A.was happening B.happens C.has happened D.happened [解析]D。as if 引导方式状语从句，同时涉及虚拟语气的用法。主从句动作同时发生，对现在假设，从句用一般过去时；若对过去假设则用过去完成时。as if后还可接to dodoing等。如：He opens his mouth as if to speak.他张开嘴好像要说话。
4.as还有以下常见搭配：
(1)Leave the book as it was.把书原样放好。
(2)Just as exercise is to the body, so is reading to the mind.正如锻炼对身体很重要，读书对大脑也一样重要。
(3)My friend Martin was very sick with a strange fever;as a result, he could neither eat nor sleep.我的朋友马丁患了一种奇怪的感冒。结果，病折腾得他既不能吃又不能睡。
(4)Steve, as usual, was the last to arrive.史蒂夫照例来得最晚。(5)Wild flowers such as orchids and primroses are becoming rare.兰花、报春花等野花越来越稀少。[来源:Zxxk.Com] 巩固性练习：
1.There at the door stood a girl about the same height ______.A.as me B.as mine C.with mine D.with me 2.______ production up by 60%, the company has had another excellent year.A.As B.For C.With D.Through 3.______ the day went on, the weather got worse.A.With B.Since C.While D.As 4.I do every single bit of house work ______ my husband Bob just does the dishes now and then.A.since B.while C.when D.as5 5.We had better hurry ______ it is getting dark.A.and B.but C.as D.unle 6.We cannot figure out ______ quite a number of insects, birds, and animals are dying out.A.that B.as C.why D.when 7.Parents should take seriously their children’s requests for sunglaes ______ eye protection is neceary in sunny weather.A.because B.though C.unle D.if 8.______ everybody knows about it, I don’t want to talk any more.A.For B.Even C.Since D.However 9.______, he doesn’t study well.A.As he is clever B.He is as clever C.Clever as he is D.As clever he is 10.Famous as he is, ______.A.his works are not widely read B.but his works are not widely read C.however his works are not widely read D.still his works are not widely read 11.______, I have never seen anyone who’s as capable as John.A.As long as I have traveled B.Now that I have traveled so much C.Much as I have traveled D.As I have traveled so much 12.______ is reported in the newspapers, talks between the two countries are making progre.A.It B.As C.That D.What 13.______ is often the case, we have worked out the production plan.A.Which B.When C.What D.As[来源:学科网ZXXK] 14.—It’s burning hot today, isn’t it? —Yes.______ yesterday.A.As was it B.So it was C.As it is D.So is it 15.It is reported that the United States uses ______ energy as the whole of Europe.A.as twice B.twice much C.twice much as D.twice as much 16.Our neighbor has ______ours.A.as a big house as B.as big a house as C.the same big house as D.a house the same big as[来源:学,科,网Z,X,X,K] 17.Americans eat ______ vegetables per person today as they did in 1910.A.more than twice B.as twice as many
C.twice as many as D.more than twice as many 18.The WTO cannot live up to its name ______ it does not include a country that is home to one fifth of mankind.A.as long as B.while C.if D.even though 19.After supper she would sit down by the fire, sometimes for ______ an hour, thinking of her young and happy days.A.as long as B.as soon as C.as much as D.as many as 20.—How far apart do they live? —______ I know, they live in the same neighborhood.A.As long as B.As far as C.As well as D.As often as 21.When a pencil is partly in a gla of water, it looks as if it ______.A.breaks B.has broken C.were broken D.had been broken 22.John shut everybody out of the kitchen ______ he could prepare his grand surprise for the party.[来源:学科网] A.which B.when C.so that D.as if 23.The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.A.seeing B.having seen C.to have seen D.to see 24.Tom kept quiet about the accident ______ lose his job.A.so not as to B.so as not to C.so as to not D.not so as to 25.A typhoon swept acro tiffs area with heavy rains and winds ______ strong as 113 miles per hour.A.too B.very C.so D.as
26.The organization encourages members to meet on a regular basis, ______ them with financial support.A.as well as providing B.as much as provide C.as good as providing D.as far as provide 27.We’re going to the cinema tonight, why don’t you come along _____? A.though B.yet C.however D.as well 28.They own a house in the city ________a villa in the countryside.A.as many as B.as much as C.as good as D.as well as 29.____is our belief that improvements in health care will lead to a stronger, more prosperous economy.A.As B.That C.This D.Such 30.Pop music is such an important part of society _____ has even influenced our language.A.as B.that C.which D.where 参考答案：1~5 BCDBC 6~10 CACCA 11~15 CBDAD 16~20 BDCAB 21~25 CCDBD 部分难题答案与解析：
1.B 搭配the same „as„，mine同my height。
16.B as„as结构中第一个as为副词，后续形容词或副词。选项C应变为the same house as big as；选项D应改为a house as big as。
29.D such表这样的人或物，构成“Such is+主语”结构，our belief后续从句为同位语从句。
30.A 后一分句缺少主语，故选择既起连接作用又担任句子成分的关系代词as。
