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.


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


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./Try as he would, he couldn’t open the door.

例2 _____ he has limited technical knowledge, the older worker has a lot of experience.

A. Since B. 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”,相当于in the way that 。

例如:When in Rome, do as Romans do./Do to others as you would have others do to you.

例3 We wanted to get home before dark, but it didn’t quite ________ as planned.

A. make out B. turn out C. go on D. 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


例如:They got united as one man./She spoke of me as her dearest friend.


例如:As a League member, you should think more of others./After graduating from the college, he firstly worked as a clerk in a big company.

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4. Linda worked for the Minnesota Manufacturing and Mining Company, ________ as 3M.

A. knowing B. known C. being known D. 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。


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.


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.



例如:We stand when the national anthem is played, as is the custom.

例5 ______ I explained on the telephone, your request will be considered at the next meeting.

A. When B. After C. As D. Since


例6 _______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.

A. As B. That C. This D. It


例7 Danby left word with my secretary ________ he would call again in the afternoon.

A. who B. that C. as D. which




例如:He swims fast, but I swim just as fast.

但它通常构成表示比较的结构“as…as…”,“not as…as…”。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。as…as 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.

The movie was not as good as I had expected./I play tennis as well as him .



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。

例8 I would like a job which pays more, but ______ I enjoy the work I’m doing at the moment.

A. in other words B. on the other hand C. for one thing D. as a matter of fact


例9 ——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 ahead D. 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。

例10 Maggie has been fortunate to find a job she loves and, _____, she gets well paid for it.

A. sooner or later B. what’s more C. as a result D. more or less


例11. The winter of 1990 was extremely bad. _______ most people say it was the worst winter of their lives.

A. At last B. In fact C. In a word D. As a result

解析:选项D. As a result起干扰作用,正确选项为B。