(一)、 as作连词的用法:
as作连词，常用来连接主句和状语从句。
1.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。eg：
He shouted aloud as her ran along.他一边往前跑，一边高声地呼喊。
I was startled as he opened the door.他一开门，我吓了一跳。
as作连词，相当于when。eg;
As a little boy (When he was a little boy)he began to learn to play piano.他小时候就开始学弹钢琴。
2.引导原因状语从句，作“因为，由于”解，与because的用法相近。eg;
I must stop writing now，as I have rather a lot of work to do.我必须停笔了，因为我还有许多工作要做。
3.引导方式状语从句或比较状语从句，作“正如，(如)像”解。例eg：
As in your country，we grow wheat in the north and rice in the south.正如(像)你们国家一样，我们在北方种小麦，在南方种大米。(方式状语从句)
When at Rome，do as Romans do.入乡随俗。(方式状语从句)
4.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。eg;
Strange as it may seem，it is true.尽管这事看上去很奇怪，但却是真的。
Try as he might，Tom could not get out of the difficulties.不管怎样努力，汤姆还是摆脱不了困境。
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。
时间状语从句：as的用法
1.某事一发生，另一事立即发生
As the sun rose the frog dispersed 太阳一出来雾就消散。
They strolled into the garden as the music ceased. 音乐声一停，他们就走进花园。
2.在某事发生的过程中另一事发生
I heard the murmur of their voices as I crossed the hall.
我走过大厅的时候听到他们在嘀咕什么。(两个动作都是一般时态)
Just as he was speaking there was a loud explosion.
正当他在说话的时候，一声巨响。(从句用进行时态)
3. 两个动作同时发生
He smiled as he passed. 他路过的时候笑了一下。
As she sang, the tears ran down her cheeks. 她一边唱歌，眼泪一边从脸颊淌下。
Helen heard the story as she washed. 海伦一边洗衣服一边听故事。
He saw that she was smiling as she read. 他看到她一边看着书一边笑。
(两个都是延续性动作)
We get wiser as we get older. 我们随着年龄的增长而变得聪明起来。
(随着时间的变化而变化)
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.
2)表示两个同步发生的动作或行为,意思是随着-----的发展.如:
As time went on / by, she became more and more beautiful .
As 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 several foreign languages. When the clock struck twelve, I had slept for 2hours.
③while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。
S he 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:
1. 引导限制性定语从句，用在“such...as”, “the same...as”，“as...as”等结构中，常译作“像...一样的人(或物)”，“凡是...的人(或物)”。
eg： He wished to be such a man as Lei Feng was.他曾希望做一个像雷锋那样的人。
My hometown is no longer the same as it was.我的家乡再也不像过去一样了。
2.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。
eg：As is well known，oceans cover more than 70% of the earth.
我们知道，海洋占地球面积的百分之七十以上。
He is very careful, as we all know.
As is well-known, belongs to China.
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. 作“如，像”解,表示好像。如:He dressed as a policeman.
They got united as one man.他们团结得像一个人一样。
2. 作“充当，作为”解,表示作为, 当作。如：I found a job as a guide.
As a writer，he was famous.作为作家，他是很有名的。
3.当某人是某身份时。如：As a child , she was sent 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
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”解。
e.g. Jack is as tall as his father.杰克和他的父亲一样高。
He doesn't speak English as/so fluently as you.他的`英语说得不如你流利
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.
五)含as的固定词组的用法
1. as soon as作“一…就”解，引导时间状语从句。
eg：As soon as I get to Beijing，I'll write to you.我一到北京，就给你写信。
2.as/so long as作“只要”解，
e.g. As/So long as you study hard，you'll make progress.只要你努力，你就会取得进步。
2. 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。
e.g. She loves the child as if/though he were her own.
她爱这个孩子如同爱自己的孩子。
3. As if/though也可用来引导表语从句，常用在“It appears/looks/seems...+as if/though”句型结构中。
e.g. It appears as if/though it is going to clear up.看起来天要晴了。
It seems as if/though he knew nothing about it.他好像对此事一无所知。4.as to作“关于，至于”解。
e.g. There is no doubt as to his honesty.他的诚实是无可置疑的。
5.as much/many as作“多达...”，“达到...之多”解。
e.g：He can earn as much as 5000 dollars a month.他每月能挣5000美元。
6.so/as far as I know作“就我所知”解，在句中作插入语。
eg： As/So far as I know，he will come here next Monday.
据我所知，他将于下星期一到这里来。
7.as a result，as a result of表示“由于...的结果”。
e.g. She died as a direct result of the accident.她的死是那次事故的直接结果。
8，as well为“也，还”之意。
e.g. Come early，and bring your brother as well.早点来，把你的弟弟也带来。
9.so as to，so...as to若跟动词原形，表示目的或结果。
eg：He studied hard so as to pass the exam.他努力学习以便通过考试。(表示目的)
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