爱美食的飘飘
as是英语学习中最为常见的介词之一，那么接下来一起去了解一下它的用法吧！
1、as作副词，表示程度，意为同样地。
在as…as…，not as…as…结构中的第一个as是副词，作和/与…(不)一样的用法。
2、as作介词作如、像、充当，作为等意思。
3、as作连词。
常用来连接主句和状语从句引导时间状语从句，作当…的时候解，有随着…之意，与while意义相近，强调两个动作同时发生；或某事一发生，另一事立即发生。
4、as作连词。
相当于when引导原因状语从句，作因为，由于解，与because的用法相近引导方式状语从句或比较状语从句，作正如，(如)像解引导让步状语从句，作虽然，尽管解。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。
5、as作关系代词。
引导限制性定语从句，用在such…as,thesame…as，as…as等结构中，常译作像…一样的人(或物)，凡是…的人(或物)。
引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是这一点。这个分句可以位于句首、句中或句末。含as的常见固定词组的用法assoonas作一…就解，
引导时间状语从句。as/so long as作只要解。as if/though常用来引导方式状语从句，作好像，仿佛解。如果从句中讲的是非真实情况，则用虚拟语气。、as to作关于，至于解。
as much/many as作多达…，达到…之多解。
雪後Sunny
英语as用法详解
想要学好英语怎么能不知道as的各种用法呢?下面就让我为大家详解一下吧。
在英语里，“as”这个字神通广大，有各种用法，下面便是其中九种：
一、用作介词。例如：
(1) As the new manager of the company, Wilcox assured the staff that he would work for the benefits of the company.
(2) The scenery here is beautiful as a picture.
二、用作表示“程度”的副词。例如：
(3) You have performed well. Other students' performance is as good.
三、用作从属连词，引导“比较”副词从句。例如：
(4) The friendship between us is as strong as a rock.
(5) Can our runners run as fast as they used to?
四、用作从属连词，引导“时间”副词从句。例如：
(6) As the new teacher entered the classroom, the pupils clapped their hands.
(7) Alex caught sight of Nancy as she was getting on the bus.
五、用作从属连词，引导“方式”副词从句。例如：
(8) You may act as you think fit.
(9) It is safer for you to do as you are told.
这些由"as"引导的从句可以节缩，如：
(10) It is safer for you to do as told.
(11) The meeting will be held as (it has been) scheduled.
(12) The weather here is not mild as (it is) in your country.
六、用作从属连词，引导“原因”副词从句。例如
(13) As the weather is fine, let's go fishing.
(14) We helped Tony, as he was a good man.
七、用作从属连词，引导“让步”副词从句。例如：
(15) Improbable as it seems, he is now Managing Director.
(16) Young as Sam is, he has performed his task creditably.
八、用作关系代词，引导形容词从句。例如：
(17) Is this the same thing as you showed me before?
(18) You can visit such places as you want to.
注意，“as”之前有“the same”或“such”和它挂钩。
九、协助组成短语与句型。例如：
(19) So as to: They departed early so as to reach the airport early.
(20) We have touched on the basic issues. As for thorny problems, let's look into them later.
(21) As long as you work hard, you will make it.
(22) I'll help you as best I can.
(23) Maria's idea is not so much a solution as a proposal to sound out our views on the project.
