as的用法：
As
prep.
1.\x05像；如同
They were all dressed as clown.他们都打扮成小丑.
2.\x05作为；当作
Treat me as a friend.要把我当作朋友.
The news came as a shock.消息传来,令人震惊.
She had been there often as a child(=when she was a child.) 她小时候常去那里.
adv.
as ---as---
conj.
1.\x05当---时；随着=while sth else is happening
He sat watching her as she got ready.他一直坐着看她准备停当.
As she grew older she gained in confidence.随着年龄的增长她的信心增加了.
2.\x05照---方式 =in the way in which
They did as I had asked.他们是按照我的要求做的.
Leave the papers as they are.别去动那些文件.
3.\x05因为；由于
As you were out,I left a message.
She may need some help as she’s new.她是新来的,可能需要一些帮助.
4.\x05正如；如同 （在《最新高级英汉词典》中这一条归为代词）
As you know,Julia is leaving soon.你是知道的,朱莉娅马上要离开了.
She’s very tall,as is her mother.她个子很高,和她母亲一样.
还有：the same---as---
5.\x05尽管；虽然；即使
Happy as they were,there was something missing.尽管他们很快乐,但总缺少点什么.
Try as he might (=however hard he tried),he couldn’t open the door.他想尽了办法,也没能打开门.
相近词so的用法：
一、so作副词用，意为“这样”、“如此”，常用来代替整个句子或某一情况的全部，在口语中常与think, hope, say, be afraid等词语连用，表示客气、委婉的答语。例如：
1）—I think English is more useful than Chinese. What about you?我认为英语比汉语更有用，你说呢？
—I don't think so. I think they are both useful.我不这样想，我认为它们都有用。
2）—Will it be fine tomorrow?明天天气会好吗？
—I hope so.但愿如此。
二、so作连词用，意为“因而”、“所以”、“为了”、“以便”等。例如：
Wang Tao's pen was broken, so he needed a new one. 王涛的钢笔坏了，所以他需要买枝新的。
注意：用英语表达“因为……，所以……”时，用了because就不能再用so，用了so就不能再用because。请注意下面汉语句子的英语译法：
因为他病了，所以没去上学。
误：Because he was ill, so he didn't go to school.
正：Because he was ill, he didn't go to school.
正：He was ill, so he didn't go to school.
三、so用作副词，在句中可以修饰形容词或副词。
1.so表示程度，意为“这么”、“那么”、“如此地”。例如：
When he came back, I was so tired. 当他回来的时候，我疲劳极了。
2. so常用于口语，意为“非常”、“很”。例如：
—I found it in my bag five minutes ago.五分钟前我在我的包里找到了它。
—I'm so glad.我很高兴。
3. 在“so 助动词/be动词/情态动词 主语”的倒装结构中，表示前面所述的肯定情况也适合于后者。
例如： I'm good at English, and so is my sister. 我英语学得好，我妹妹学得也好。
I like English and so does she. 我喜欢英语，她也喜欢。
注意：在这一结构中的主语可以是名词或人称代词，但它和上文的主语不是同一个“人”或“物”。
例如： —She bought a computer.她买了一台电脑。
—So did I.我也买了一台。
另外，这一结构的否定式是“neither/nor 助动词/be动词/情态动词 主语”。例如：
—He doesn't know Lin Tao's address. 他不知道林涛的地址。
—Neither do I. 我也不知道。
这里的neither/nor意为“也不”或“也没有”。
4. 在“so 主语 助动词/be动词/情态动词”结构中，so用于对前面事实的肯定，有“的确如此”之意。
例如： —He will go to Hangzhou for a holiday tomorrow.他明天要去杭州度假。
—So he will.的确如此。
注意：这一结构中的主语和上文中的主语通常是同一个“人”或“物”。又如：
—It's her turn now.现在轮到她了。 —So it is!是呀！
5.在“主语 do（动词某种形式） so”结构中，so用以避免重复前文提到的情况。
例如： The teacher asked us to read the text and we did so.老师让我们读这篇课文，我们就读了。
As
prep.
1. 像；如同
They were all dressed as clown. 他们都打扮成小丑。
2. 作为；当作
Treat me as a friend. 要把我当作朋友。
The news came as a shock. 消息传来，令人震惊。
She had been there often as a child(=when she was a child.) 她小时候常去那里。
adv.
as ---as---
conj.
1. 当---时；随着=while sth else is happening
He sat watching her as she got ready. 他一直坐着看她准备停当。
As she grew older she gained in confidence. 随着年龄的增长她的信心增加了。
2. 照---方式 =in the way in which
They did as I had asked. 他们是按照我的要求做的。
Leave the papers as they are. 别去动那些文件。
3. 因为；由于
As you were out, I left a message.
She may need some help as she’s new. 她是新来的，可能需要一些帮助。
4. 正如；如同 （在《最新高级英汉词典》中这一条归为代词）
As you know, Julia is leaving soon. 你是知道的，朱莉娅马上要离开了。
She’s very tall, as is her mother. 她个子很高，和她母亲一样。
还有：the same---as---
5. 尽管；虽然；即使
Happy as they were, there was something missing. 尽管他们很快乐，但总缺少点什么。
Try as he might (=however hard he tried), he couldn’t open the door. 他想尽了办法， 也没能打开门。本回答被网友采纳
副词 ad.
1.跟...一样地,同样地
Sam is as rich as Alexander.
山姆像亚历山大一样富有。
2.如同;例如
Such animals as foxes and squirrels have bushy tails.
有些动物,如狐和松鼠,有蓬松的尾巴。
介词 prep.
1.作为,以...的身份
She works as an interpreter in that company.
她在该公司里担任翻译员。
2.当作
She didn't think much of him as a painter.
她对他作为一位画家评价不高。
3.像;如同
The old woman was dressed as a young lady.
这位老妇人打扮得像一位年轻人。
连接词 conj.
1.像...一样;依照;像
You ought to do as Paul tells you.
你应按照保罗吩咐的做。
The work is not so difficult as you imagine.
这工作不像你想像的那么困难。
2.当...时
As she left the room she remembered that book.
她离开房间时想起了那本书。
3.随着
As the sun rose the fog dispersed.
太阳一出来,雾随之消失。
4.因为
We didn't know what to do as we were just visiting there.
我们不知道该怎么办,因为当时我们仅仅在那里作访问。
5.虽然
Tired as he was, he sat up late.
他虽然疲倦,可仍然很晚才睡。
代词 pron.
1.(与such,the same,as等连用,引导关系从句)与...相同的事物(或人)
He has earned as much money as I have.
他赚的钱和我赚的一样多。
She felt just the same as he did.
她和他的感受相同。
There is a general rise in prices such as occurred in the late 60's.
物价普遍上涨,跟六十年代末一样。
2.(引导从句,对前述内容作补充)本情况,该事实
She has married again, as was expected.
她已再婚,这是意料中的事。
We are tired, as anyone can see.
我们累了,这是有目共睹的。
