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As的用法小结
（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.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)接名词表示某一个年龄段时.如: As a young man, he was active in sports.As a little boy(When he was a little boy)he began to learn to play the piano.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 2 hours.I was wandering through the street when I caught sight of a tailor’s shop有意料之外的意思
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
如:Work while you work.Play while you play.Strike while the iron is hot趁着
2.As =Since 作“既然”、“由于”解,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.Take the medicine as directed.Maglev trains don’t make much noise, as planes do.When at Rome，do as Romans do．入乡随俗
As in your country，we grow wheat in the north and rice in the South.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 poible.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: Tired as they were, they walked on.Child as he is，he knows a lot．Fast as he ran，he didn't catch the bus．Much as I respect him, I won’t do as suggests.Try as you may, you might fail again Try as he might，Tom could not get out of the difficulties． 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.另外,当先行词被the same, such, so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.He wished to be such a man as Lei Feng was．
I was reading the same book as he bought yesterday.This book is not such as I expect Note: He took the police back to the same place where he witneed the robbery
（三）、as作介词的用法.1.表示好像。如:He dreed as a policeman.They got united as one man．
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 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）、作副词的用法表示与------等同。如：This dre is twice as expensive as that one.像，如等。As before, he remained unmoved.He doesn't speak English as／so fluently as you．
（3）英语中有很多表示比较的成语。
as black as coal
as blind as a bat
as brave as a lion
as bright as day
as busy as a bee
as cold as ice
as easy as ABC
as fat as a pig
as hot as fire
as light as air ／a feather
as like as two peas ／beans
as poor as a church mouse
as rich as a Jew
as sound as a bell状况极佳;十分健康 as fit as a fiddle
as strong as a horse
as stupid as a donkey
as sweet as honey ／sugar
as white as snow
as red as blood
as bright as a button
as wise as Solomon
(五）含as的固定词组的用法
1.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，eg； As／So long as you study hard，you'll make progre．
比较：I've waited as long as two hours．我一直等了整整两小时。
3．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。eg：She loves the child as if／though he were her own．
As if／though也可用来引导表语从句，常用在“It looks／seems．．．+as if／though”句型结构中。It looks to me as if／though it is going to clear up．It seems as if／though he knew nothing about it.You look as though you slept badly.4．as to作“关于，至于”解。eg；There is no doubt as to his honesty．
5．as much／many as“多达…”，“达到…之多”eg：He can earn as much as 5000 dollars a month．
6．As／So far as I know，he will come here next Monday．据我所知，比较：We might go as far as the school and back．我们可以走到学校那边，然后回来。7．She died as a direct result of the accident．表示“由于．．．的结果”。
8，as well为“也，还”之意。eg： Come early，and bring your brother as well．
9．so as to，表示目的so．．．as to表示结果。eg：He studied hard so as to pa the exam．他努力学习以便通过考试。(表示目的)
10．as a matter of fact实际上，事实上
As a matter of fact，I'm very fond of house work．
11．as follows如下
Our plan is as follows．
12．as for至于，说到
As for me，I shall never return there．
13．as good as几乎已经，实际已经
Everything was as good as settled．一切都差不多安排好了.She is as good as her words.她遵守诺言。He as good as said I'm a liar.他无异于说我撒谎。
比较：Your composition is as good as his．你的作文和他的作文一样好。
另外，还有以下习惯搭配，其翻译不能随便从字面来理解：
(as)good as gold 表现很好的(as)good as new 完好如新
as good as one’s word 守信 as good as pie 很好的，可爱的，讨人喜欢
(as)good as a play 非常有趣
14.as well as同样，和，也，而且
She called on you as well as I．不但我来看你，她也拜访了你。She called on you as well as me． 她不但拜访了我，也拜访了你。
在下列句中，as well as表示“像„一样”的涵义：She as well as you is an English teacher．
她像你一样也是英文教师。
George hasn’t gone abroad as well as his brother.乔治并没有和他兄弟一样出国去。（他兄弟一人出国）George, as well as his brother, hasn’t gone abroad.乔治和他兄弟都没有出国。
1）as well as 可连接并列的单词或短语 前后两个动词的时态要一致。即：若第一个动词是一般现在时，第二个动词也应是一般现在时；若第一个动词是一般过去时，第二个动词也应是一般过去时。例如：
He publishes（published）as well as prints（printed）his own books．他的书是自己印刷并出版的。
2）如果第一个动词是复合时态，或由can，may，must等加动词构成时，as well as后面可省去助动词或情态动词，此时，as well as意为“既„„又„„”。例如： We are repairing the roof as well as painting the walls．我们在粉刷墙壁，同时也在修理屋顶。
She can ／could sing as well as dance．她既会跳舞也会唱歌。
3）如果第一个动词是不定式，as well as后面的动词也要用不定式，但要去掉to。例如：
You can't expect her to do the housework as well as look after the children．你不可能叫她既照管孩子又做家务。
⑷注意as well as的另外两层涵义：1）as well as还有“除„„之外”之意。例如：
As well as knowing some Ruian，she speaks English very well．除了懂得一点俄语之外，她的英语讲得很好。
比较：He can speak English as well as she does．他和她英语讲得一样好。
15．as many ／much ／deep ／large，ect．as达……程度，多／深／大……达
As early as his second film，Chaplin had developed his own manner of acting．
早在他第二部电影中，卓别林就形成了自己的表演风格。
The well is as deep as eight metres．这口井深达八米。
16．as usual像平常一样
She would go homeas usual for Christmas．
17．such as像……之类，例如
He knows a lot of poets，such as Shelley and Byron．
18．may（might ／could）as well不妨，不如
You may as well wait upstairs．
you might as well throw the money into the sea as lend it to him．
19.as a rule作为一个常规,通常,习以为常As a rule, we keep records on all the experiments so that we may have enough data.20.As a whole作为一个整体(来看)We should analyze the problem as a whole.21.As above如上It has been explained as above.
22.as…as ever像往常一样……She works as hard as ever.她工作一贯努力。
23.as it is(was)①在句首,“但在实际上”;②在句末,“照原来样子”。As it was, we did help them.事实上,我们的确帮了他们。Leave the things as they are.别动这些东西。
24.as matters stand按目前情况来说 As matters stand, he does not like to make the plan public.就目前情况而论,他不愿公开那个计划。
