as可用作连词，引导比较、时间、原因及方式等四种状语从句，应注意的是，引导的比较状语从句往往有省略；引导的时间状语从句一般用一般现在时而不用一般将来时;引导原因状语从句时与“Becau”和“since”引导的从句比较起起来语气最弱.
as作介词，意思时“作为”,“以……身份”.例如：He came to China as a tourist five years ago.
而表示像…一样时，like通常作介词用，而介词后面通常接名词，代名词和动名词。
as in Australia“和在澳大利亚一样”.
as……as
AS +adj(原级)+AS
AS +adv(原级)+AS
as soon as 一……就
as soon as possible 尽可能快地
超能陆战队主题曲
as early as possible 尽可能早的
速度与激情7音乐as carefully as you can 尽可能认真地
as careful as you can 尽可能认真的
1.as是连词，表示“随着”的意义.lives是life的复数，意义是“生活”.〈BR>
2。as是连词,表示“因为，由于”的意义.wanting是现在分词,表示主动意义,wanting to buy cars=who want to buy cars。
As的用法小结
as可以作连词、介词及关系代词和副词。现将其用法小结如下：
明发外滩中心
（一）、 as作连词的用法:
1.作“在-—-—-—-期间,当-——-的时候"引导时间状语从句。注意与when、 while的用法区别。
①下列情形时,只用as， 而不用when或while。
1)用于表示同一个人的两种动作交替进行,指一边-———一边。 如：
The girl sings as she goes to school.
He looked behind occasionally as he went forward in the forest.
山东外事翻译2)表示两个同步发生的动作或行?意思是随着———-—的发展.如：
As time went on / by, she became more and more beautiful .
mahdiAs children get older， they become more and more interested in everything.
3）表示两个短暂行为或事情几乎同时发生.如：I watched her as she read the book。
I thought of it just as you opened your mouth。
Just as the flying worm hit her face， she gave a loud cry.
4)接在名词后面表示某一个年龄段时.如：
As a young man， he was active in sports。
②when作”当……的时候"解,可以指较短的（一点）时间,也可指一段时间。如：When I was at college， I could speak veral foreign languages. When the clock struck twelve， I had slept for 2hours。
③ while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:Work while you work。 Play while you play。
2. As =Since 作"既然"、”由于”解，引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如： As he’s been ill for ages, I will help him.
As / Since you're not feeling well， you may stay at home。
As he wasn’t ready ， we went without him。
3。 As =in the way that作”像"、”按照……的方式”解，引导方式状语从句。如:
Do as I told you.
Remember， you must do everything as I do.
4。 用于as--- as或not / so/ as ---- as中，前一个as是副词,后一个as是连词，引导比较状语从句。如:They helped the old as much as possible.
I don't speak English so/ as well as she does。
5。 表示虽然，尽管 等，引导让步状语从句，常用倒装语序,模式为:
adj. /adv. / n.+as +主语+谓语+主句。如： Young as he is, he knows much.
Tired as they were， they walked on.
6。 表示也—--—--一样。 She is a doctor， as was her husband.
（二）、 as作关系代词,引导定语从句,表示正如，这一点.如:
He is very careful， as we all know。
As is well—known, Taiwan belongs to China。
陈规另外,当先行词被the same, such等词修饰时，常用as来引导定语从句。如:
Such a clever girl as she can learn anything quickly.
I was reading the same book as he bought yesterday。
（三）、as作介词的用法。
1.表示好像。如:He dresd as a policeman.
2。 表示作为当作。如：I found a job as a guide.
3. 当某人是某身份时。如：As a child ， she was nt to abroad。
4。 as引导的介词短语大多用作状语,as译为”作为";少数情况可引起宾语补足语。如:
As a Party member, I’ll take the lead in everything. (状语）
She works as a model。 （状语)
She has me as one of her best friends.(引起宾语补足语)
（四）、作副词的用法 1 表示与--——--等同。如：This dress is twice as expensive as that one. 2 像，如等。如：As before， he remained unmoved.
总之,通过以上的分析，我们对as的词性和用法有了比较全面的理解和把握，才能在实际的运用中做到心中有数,应付裕如。
常见词as用法总结
近几年高考中有关as一词的题目出现过很多次，其中as或是最佳选项，或是干扰项，或是题干中的关键信息点，涉及as作为连词、介词、关系代词、副词以及习语等各种用法。现结合高考试题将as的用法归纳如下:
一、 用作连词的as
voltdb 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 nt to six different schools. 此用法中as多表示从句与主句动作同时进行,一般不与状态动词连用，意为“一边……一边……"。例如：She sang songs as she did her homework.
millenium
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。
fruits A。 since B。 when
aira C。 as D. that
解析：本题中的as与when一起作为干扰项,容易使同学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becau, 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，很多同学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 n。/Much as I like you, I couldn’t live with you。 / Try as he would, he couldn't
