1、作介词
1. He spoke as a teacher. 他作为老师发言&他以老师的身份发言（表“作为”）
2. He spoke like a teacher. 他讲话很像是老师
3. 表示“当某人是(某身份)时。例如：
As a child, she was sent to three different countries. 她儿时去过3个不同的国家。
4.表示“因某人是(某身份)”，例如：
As a gardener, hell take care of all flowers.因作为1个园丁，他将会照顾所有的花朵。
5.表示“作为，当作”，例如：
I found a job as a teacher. 我找了1份教师的工作。(take sb. as/treat sb. as...)
6.be famous as=be known as表“以..身份而著名”，注意与be famous for=be known for表“因..而闻名“的区别
He is known as a successful lawyer.
Qingdao is known for its beautiful summer.
2、用于固定词组
1.as/so long as表“只要”
As long as we dont lose heart,well find a way to overe the difficulty.只要我们不灰心，我们就能找到克服困难的办法。
Ill never forget that as long as I am living.这事我至死也不会忘记。
备注：Keep it as long as you like.你能把它保留多久，就保留多久。（还可作“...之久“）
2.so/as far as表“据…, 就… ”
As far as I know, he will be away for three months.据我所知, 他将离开3个月。
3.so as to do=in order to do表“为了”但so as to do只能放句中
They started early so as to catch the first bus.他们很早就出发了，以便能赶不上头班车。
4.so..as to do表"如此..以至于“相当于so that引导的“结果状语从句”
You are so kind as to show me the way.你真好，给我指路。
5.Not only…but…as well=not only…but also表“不但..而且..”
As well as=not only…but also
Not only you but also your wife is friendly to me.(动词跟后面的wife）
Your wife as well as you is friendly to me.（动词跟前面的wife)
不但你而且你妻子也对我很好。
注意：you look as well as you were./you look as well as before.
6.As well表“又，也”常用于句尾（无需逗号分开）
The skirt is small for me as well.这条裙子对于我来说也小了。
7.May as well=might as well表“还不如，也好”相当于=had better
I may as well go home.我还是回家好了。
8.as usual表“如平常”
i went to school as usual.我像平常1样去上学。
9.as a matter of fact=in fact表“其实;实际上”
As a matter of fact, I’m very fond of housework. 其实，我很喜欢做家务。
10.as a result表“结果，因此” (发生某种情况)
As a result, he had to leave.结果他只得离开。
而as a result of表“由于..结果“，As a result of carelessness,he drove into a lamppost.
3、作连词引导状语从句
1. 引导时间状语从句
as与when，while都是引导时间状语从句的从属连词，含义都是"当……的时候"。但它们有区别:
(1). when作“当……的时候”解，可以指较短的(1点)时间,也可指1段时间。从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生。例如:
John was having his dinner when I saw him. 当我看到约翰的时候，他正在吃饭。
She can write only when the baby is asleep. 只有婴儿睡着的时候，她才能写作。
(2). while常表示1段较长的时间或1个过程，强调主句谓语动词与从句谓语动词同时发生或在从句动作过程中发生。例如:
We must strike while the iron is hot. 要趁热打铁。
While we were reading, the teacher came in. 我们正在读书的时候，老师走了进来。
(3). 但属下列情形时，只用as, 而不用when或while。
1 用于表示同1个人的两种动作交替进行,指“1边……,1边……”。例如:
The girl dances as she sings on the stage.那个女孩在舞台边唱歌边跳舞。
He looked behind from time to time as he went forward. 当他朝前走时，不时地向后看。
2 表示两个同步发展的动作或行为,译为“随着……”。例如:
As time went on / by, she became more and more worried. 随着时间的流逝，她变得越来越焦虑。
As he grew older, he bec
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