A. adv. to the same degree or amount; equally 同样地，一样地
He was angry, but she was just as angry.
=She was as angry as he was.
他生气了，但她同样生气。
He has a lot of time but I don’t have as much (as he does).
=I have less time than he has.
他有很多时间，但我没有那么多。
B. prep.
(1) in the same way as; like像，如同
Everyone rose as one.
=everyone rose together.
大家一起同时起立。
I only like such small animals as cats and dogs. 我只喜欢像猫和狗一类的小动物。
as和like在汉语中都译做“像”，但字面下的隐含意思是不同的。
like侧重A与B两者间的比较，并不意味着A和B属于一类或完全相似。
He speaks English like an Englishman.
=He speaks English in a way an Englishman speaks English.
他说起英语来有些像英国人。
as则侧重于同一性，意味着A与B两者属于同一类或完全相似。
He speaks English as an Englishman.
=He speaks English as well as an English.
他说起英语来和英国人一样好。
She was dressed as a man. 她打扮成了男人。(俨然她就是个男人了)。(相同事物)
She was dressed like a man. 她像男人那样穿衣服(依然可见她是个女人)。(不同事物)
(2) in the capacity/job/role/character/condition/function of以...身份，以...为职业，扮演...角色，具有...特性，在...状态下，起...功能/作用
As a schoolboy, he showed every sign of genius. 当他还是个小学生的时候，就显示出了天资聪慧。
The forest will act as a defense against desert dust. 森林能起防御沙漠灰沙的作用。
The news came as no surprise. 这消息来得并不突然。
The man was described as tall and dark, and aged about 20. 据描述这男人高个子，深色皮肤，年龄在20岁左右。
They regarded the lecture as boring. 他们认为讲座很乏味。
Many people use education as a steppingstone to a better life.许多人将教育作为赢得更好的生活的手段。
I used to look on him as a friend. 我以前把他看作是一位朋友。
C. conj.
(1) to the amount or degree that 像...一样(引导比较状语从句)
The fabric was as soft as silk. 那件织品软得像丝绸。
(2) in the way in which 以...方式，如同...那样(引导表语从句和方式状语从句)
It is as you told me. 事情正如你告诉我的那样。
Do in
(3) in spite of the fact that, though虽然，尽管(引导让步状语从句)
(a) adj./v-ed2/v-ing+as+主语+系动词。如：
Oldest as he is in the office, he works hardest.尽管他是办公室里年龄最大的，他工作最努力。
注意：adj./adv.最高级前应省去定冠词the。
Well-written as the book is, the author is not satisfied and prepared to revise it.尽管这本书写得很好，作者还是不满意并打算修改它。
(b) adv.+as+主语+谓语部分。如：
Much as I admire his courage, I don’t think he acted wisely.我虽然崇拜他的勇气，但我认为他这样做是不明智的。
(c) n./pron.+as+主语+系动词。如：
Student as he is, he does not study hard.他虽然是个学生，却不努力学习。
You can use my bike, such as it is. 尽管我的自行车不好，请将就用吧。
注意：单形可数n.[c, s]前应省去冠词a(n)。
(d) 动词原形+as+主语+谓语的其它部分(时态助动词/情态动词)。如：
Try as you will, you won’t be able to persuade him.不管你怎么努力，你都说服不了他。
(4) at or during the time that; when; while当...的时候；随着...(引导时间状语从句)
He slipped as he was walking to his car. 当他走向车子时，他摔倒了。
He became stout as he grew older. 随着年龄的增长，他发胖了。
(5) for the reason that; because, since因为(引导原因状语从句)
She may need some help as she's new. 他可能需要帮助，因为他是新手。
D. pron.
(1) that, who, which, esp. used in the structure “as/so...as...; such(...)as...; the same(...)as...” 象...那样的人(或事物)；凡是...的人(或事物)(as作关系代词，引导定语从句，在从句中作n.性成分。)
She will marry as wealthy a man as she can find. 她将嫁给她能找到的任何一个有钱人。
There is so warm a house as we want to live in. 这里有如此暖和的房子，我们都想住在里面。
He is not such a fool as he looks. 他不像外表那样愚蠢。
He is not the same man as he was. 他已不是从前那个人了。
(2) which fact这一点
As we had expected, he succeeded in the end.正如我们所料，他最终取得了成功。
As is well known, knowledge comes form practice.众所周知，知识来源于实践。
Set Phrase
1. as against phr. prep. in comparison with与...相比
There are 25 girl students in our class as against only 5 in Class Two. 我们班有25名女学生，而二班只有5名。
2. as and when phr. adv. 可能时；conj. 到...时候
I'll tell you more as and when (= as soon as I can). 我一有可能就会告诉你更多情况。
We'll decide on our team as and when we qualify foe the competition. 我们等到有资格参赛时，再来决定本队参赛人员。
3. as for phr. prep. with regard to; concerning (用于引入新话题) 关于，至于，说起
As for you, you ought to be ashamed of yourself.至于你，你应该感到惭愧。
As for the hotel, it was very uncomfortable and miles from the sea.至于旅馆呢，非常不舒服，而且离海边有好几里地。
4. as from phr. prep. 从...时起(=as of) ；来自；因...而起
The new law takes effect as from [=as of] July 1. 新法律从
He is pasting a clipping, as from a newspaper. 他在粘贴一份剪报。
He has sore feet, as from too much walking. 他因走了太多的路而走痛了脚。
5. as if/as though phr. conj. 好像，仿佛引导表语从句/方式状语从句
It looks as if it is going to rain. 看来要下雨了。
He looks as if he had seen a ghost. 他像见了鬼似的。
He opened his lips as if to say something. 他张开嘴似乎要说些什么.
She ran as if the Old Boy were after her. 她跑得飞快好像魔鬼在追她似的。
-He'll never come back, you know! 你知道他永远不会回来了。
-As if I cared!” [=I don't care] 好像我多在乎似的(我不在乎)。
6. as is in the present condition without any changes 照现在的样子
Everything on sale here is sold as is. 这里出售的东西是按标价出售的。
7. as it is
a. in reality 事实上
As it is, we can hardly get to the station by 6 o’clock. 事实上，我们六点钟前很难到达车站。
b. in the present condition 照现状
Let it remain as it is.听其自然吧。
c. already已经
Don’t say anything else; you are in enough trouble as it is. 不要再说了，你现在已经够麻烦的了。
8. as it were as one might say; in a way that is not quite exact 可以说；在某种程度上
She is, as it were, a walking dictionary. 她可以说是一部活字典。
9. as of 在...时；到...-时为止；从...时起
As of this writing, no reply has been received. 到写这封信时为止，还没有得到回音。
10. as..., so...像...那样，...也就...；随着...，也就...
As you sow, so will you reap.种瓜得瓜，种豆得豆。
11. as such
a. 照此，就以这种资格
He was a guest and was treated as such. 他是个客人，并被作为客人来款待。
b. 本身，就本身而论
He did not oppose the scheme as such. 就计划本身来说，他并不反对。
c. (常用于否定句)严格说来，如所指的人/事物那样
The new job is not a promotion as such, but it has good prospects. 这一新的工作，严格说来并不算提升，不过以後很有发展前途。
How can there be things as such? 哪会有这种事?
11. as to
a. about, esp used in arguing or making decision (尤用于争论和做出决定时)有关，关于
As to the plan, I think it is quite good. 至于这个计划，我认为很不错的。
b. according to; by依照
The books in the library were distributed as to subjects.图书馆里的藏书按科目分类。
12. as was BrE, infml, formerly, originally, used after a former name 先前的，原来的
Myanmar―Burma as was [=Myanmar, which was formerly called Burma] Myanmar―原来称作Burma
13. as+be/时态助动词/情态动词+主语 fml used to add that what you have said is also true of someone or something else (甲...)，乙也...
Eve's very tall, as/so was her mother. 伊芙个子很高，她妈妈也一样。
I voted Labour, as/so did my wife. 我投了劳动党的票，我妻子也一样。
14. as well (as)
a 与...一样好
She did as well (as anybody else). 她做得(比别人)毫不逊色。
b 除...之外，也，和
He is an actor, and a director as well. 他是演员，也是导演。
He grows flowers as well as vegetables. 他既种菜也种花。
The boy is lively as well as healthy. 这个男孩既活泼又健康。
15. as yet until now or until a particular time in the past (多与否定句连用)至今(仍不) ，到目前为止(还没有)
As yet we have not heard from him. 我们到现在还没有收到他的信。
As yet little was known of the causes of the disease. 这时还不清楚这种病的起因。
16. so as to-v for the purpose that is为了(后接不定式目的状语)
We left for the station early so as to catch the first train.
我们很早就动身去车站以便赶上头班火车。
17. so...as to-v that the result is以至于(后接不定式结果状语)
(a) so+adj.(+a(n)+n.[c,s])+as+to-v
Would you be so kind as to turn down the radio? 劳驾你把收音机调小声一点好吗？
He is so sensible and clever (a boy) as to be much loved by us. 他是一个懂事聪明的孩子，很讨我们的喜欢。
(b) so+many/few+n.[c,p]+as+to-v
so+much/little/+n.[u]+as+to-v
I were asked so many questions as to get confused. 他们问了许多问题，把我弄糊涂了。
I did so much housework as to be worn out. 我做了很多家务，累得精疲国竭。
(c) such+as+to-v
His illness is such as to cause anxiety. 他病得很重，令人担忧。
(d) such+a(n)(+adj.)+n.[c,s]+as+to-v
He is such a kind man as to be ready to lend a helping hand. 他为人善良，愿意助人。
We had such a lovely day as to go out on a picnic. 我们遇到了好天气，出去野餐了。
(e) such(+adj.)+n.[c,p]/[u]+as+to-v
He told such funny jokes as to make the party full of joys. 他讲了很多有趣的笑话，这使宴会充满了欢乐。
He had such bad food as to throw up afterwards.他吃了坏食物，后来呕吐了。
18. such as(用于列举) 像...这种的；像...那样的；诸如...之类的
We have different pies, such as apple, cherry, and strawberry pies./We have such different pies as apple, cherry, and strawberry pies. 我们有不同的派，例如苹果、樱桃和草莓派。
19. such as it is/such as they are used to say that something is not very good in quality or condition 尽管质量不好
The food, such as it is, is plentiful. 食物虽不精，但量足。
20. as you do (用于对自己刚说过的意思表示具有讽刺意味的看法)真不容易啊，真不简单啊
He smiled and I smiled back. As you do. 他微笑，我也报以微笑。真不容易啊。
21. the same...as...与...同一个...
He works in the same building as my brother.
=He and my brother work in the same building.
他和我弟弟在同一个大楼内工作。