请看2005年一道湖南高考试题：
The more I think about him, the more reasons I find for loving him _____ I did.
A. as much as B. as long as
C. as soon as D. as far as
在2005的高考考纲词汇表和英语教学大纲中对as的用法表述如下：1）conj. & adv.像……一样；如同; 2）as...as...像，如同； 3）not so...as不像、不如； 4）as if / as though好像、好似；5）prep. 作为、当作。但从历年高考试题可以看出，作为高考重要考点的as的命题范围不仅仅限于以上五点，这是由as本身的多功能用法所决定的。本文结合历年高考试题，对其常见的考点进行剖析。
考点一：用于比较级，表示“相等、相似、一样”。
结构是as...as...，前一个as是副词，在否定句中也可以用so，后跟被修饰的形容词或副词原级。如果所跟形容词修饰可数名词单数，则用as + adj. + a (an) + 名词 + as...，其中后面的as是连词。
[考例]
He speaks English well indeed, but of course not _____ a native speaker. (2004上海)
A. as fluent as B. more fluent than
C. so fluently as D. much fluently than
[解析]答案为C。根据句意可看出应该是用副词修饰谓语动词speak，排除形容词的A、B项；根据比较级排除D项，C项是so...as...结构，由于是否定句，所以选“so fluently as”。
考点二：as many / much / far / long...as + 具体数目表示达到某种程度,译作“多达…… / 远到…… / 时间长达……”。
[考例1]
John is the tallest boy in the class _______ according to himself. (2005安徽)
A. five foot eight as tall as
B. as tall as five foot eight
C. as five foot eight tall as
D. as tall five foot eight as
[解析] 答案为B。根据句意可看出是表示“高达5.8英尺”，所以用本结构，表示具体高度的five foot eight应该置于连词as之后，排除A、C和D。
[考例2]
After supper she would sit down by the fire, sometimes for _______ an hour, thinking of her young and happy days. (2003上海春招)
A. as long as B. as soon as
C. as much as D. as many as
[解析] 答案为A。本题考查相同比较级结构的不同意义。根据题干中的具体时间an hour可以看出是指时间的长度。
考点三：as用于表示倍数的句型中
如果表示A是B的X倍可以用句型“A is X times as + adj. / adv. + as B.”。
[考例1]
What a terrible table! I’ve never seen such a thing before. It is _______ it is long. (2005湖北)
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] 答案为C。根据倍数表达方式排除B和D,根据句意看出not否定be动词,本句意为：“这是一张什么样的桌子!我以前从来没有见过这样的东西,它的宽度竟然不到它的长度的一半”。
[考例2]
The house rent is expensive. I’ve got about half the space I had at home and I’m paying _______ here.(2003上海)
A. as three times much
B. as much three times
C. much as three times
D. three times as much
[解析] 答案为D。根据句型结构把倍数置于as之前，排除A、B和C，因此只有D项符合。
考点四：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。
[考例]
The houses are sold at such a low price _______ people expect. (2000上海春招)
A. like B. as
C. that D. which
[解析] 答案为B。如果按照“such...that...”的结构理解为“如此……以至于……”，则不符合题意，因此应该理解为定语从句。事实上，根据从句中的expect是及物动词，而其没有宾语，可以推断所需要的连接从句的连词在从句中作宾语，那么只有从定语从句方面考虑。
要注意与such...that...所引导的结果状语从句之间的区别。如果从句中缺少主语、宾语或表语，就说明所用的连词是关系代词，从而可以推断是定语从句，否则就视为状语从句。例如：He made such rapid progress that before long he began to write articles in English for an American newspaper.
考点五：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，which不可以置于句首，而as可以，并且还有“
就像、正如”之意。
[考例]
_______ is reported in the newspapers, talks between the two countries are making progress. (2004北京)
A. It B. As
C. That D. What
[解析] 答案为B。本题考查as引导的非限制性定语从句的用法。根据句中的逗号可以看出是复合句，需要连词连接，排除A；What引导名词性从句；That不可以引导非限制性定语从句。所以只可以选B，as引导非限制性定语从句。
考点六：as用于不定式中
不定式短语so as to do sth.在句中作目的状语，同in order to do sth.，但不可以用于句首； so + adj. / adv. + as to do sth.在句中作结果状语，（例如：The bird flew so fast as to escape being shot.）二者的否定形式是在to前直接加not。
[考例1]
All these gifts must be mailed immediately _______ in time for Christmas. (2005辽宁)
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] 答案为C。本题的so as to也可以换作in order to，由此可以看出所给的四个选项的区别在于不定式时态和语态上。根据句子的主语可以推出不定式应该是被动形式，即礼物“被收到”。考点七：as...as...形为比较级，实际上已经被赋予其他意义，可以作连词，多用于引导状语从句，从句的谓语动词要用一般现在时表示一般将来时，一般过去时表示过去将来时。例如：
1. as soon as“一……就……”。
[考例]
The new secretary is supposed to report to the manager as soon as she arrives.(1990 MET)
2. as far as“就……而言, 远到，一直到，至于、到达某一点、程度或范围”。
[考例]
_______ I can see, there is only one possible way to keep away from the danger. (2004北京春
招)
A. As long as B. As far as
C. Just as D. Even if
3. as(so) long as“只要……就……”。
[考例]
_______ I know, the money is safe. I shall not worry about it. (2003北京)
A. Even though B. Unless
C. As long as D. While
4. as well as “与……一样”，而as well 有too（也）的意思。
[考例]
Let Harry play with your toys as well, Clare, you must learn to share. （2000 NMET）
注意当as well as 连接两个主语，强调前者，所以谓语动词的人称和数应与前面的主语保持一致。试比较：
Not only Peter but also his parents are going to pay a visit to the Great Wall.
Peter as well as his parents is going to pay a visit to the Great Wall.
5. as good as“几乎、几乎等于、像……一样”。例如：
The book he lost is as good as new.
考点八: 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，意思是“当……时”，同while / when，更强调“一边……一边……”。表“随着……”的意思时同with，但with是介词，不可以跟句子。
[考例1]
With production up by 60%, the company has had another excellent year. (2000 NMET)
[考例2]
Mother was worried because little Alice was ill, especially as Father was away in France. (1994 NMET)
[考例3]
As the day went on, the weather got worse. (1990 MET)
2. 引导原因状语从句，同since。
[考例]
We had better hurry _______ it is getting dark.(1984 MET)
A. and B. but
C. as D. unless
3. 引导让步状语从句，意思同though或although，但通常要用倒装结构。可以把从句中宾语、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。
[考例1]
_______, Carolina couldn’t get the door open.（2005广东）
A. Try as she might B. As she might try
C. She might as try D. Might she as try
[考例2]
_______, I have never seen anyone who’s as capable as John. （2001上海）
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
[考例3]
_______, he talks a lot about his favorite singers after class. （2005重庆）
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]答案为B。当as从句是主系表结构，而且表语是可数名词单数时，置于as前的名词前要省略冠词。
4. 引导方式状语从句，表示方式。意思是“像, 按照, 如同”。例如：
You should finish your task as you are told to.
你应该按我说的那样把工作完成。
Leave it as it is. 保持原状, 不要动它。
考点九：as if (as though)“好像，好似”，引导状语从句。
一般用虚拟语气；对于可能发生的事情，也可以用陈述语气。
[考例]
When a pencil is put in a glass of water, it looks as if it _______.(1994 NMET)
A. breaks B. has broken
C. were broken D. had been broken
再例如：You look as if you’ve been running. 你好像跑了一阵似的。
You look as if you’d seen a ghost. 你像是见了鬼似的。
前一例中的“you”的确跑过，所以用陈述语气；而第二句中的“you”可能并没有看见鬼，只是表现出受惊的样子而已，所以用虚拟语气。
考点十：as 作为介词
作介词的as意思是“作为 / 以……的身份，作为 / 充当角色、身份或功能的”，而介词like的意思是“像……，诸如”。
[考例1]
I feel that one of my main duties _______ a teacher is to help the students to become better learners. (2004广东)
A. for B. by
C. as D. with
[考例2]
_______ most students, she was always prepared and never came to class late. (1998上海)
A. Like B. As
C. For D. To
另外，以下与as有关的短语应引起考生们的重视。
as it is 事实上、其实； as it were 可以说是、好像； act as 担当、扮演、担任； work as担任; regard / consider / have / treat / look on / sb. as... 把……看作……；认为……是; as follows 如下； as a matter of fact事实上；such as诸如；as usual跟往常一样；be famous（known） as以（作为……）而闻名；begin as开始是……；as a result (consequence)结果是……；as a
rule通常、一般；as the old saying goes俗话说。 
