as作连词,引状从。1)表"当......时候",引时状从,强调两个动作同时发生,或某事一发生,另一事立即发生。如：She sang a song as she walked. 她边走边唱着一首歌。2)表"因为"、"由于",引原状从，与because相近。如：I must stop writing, as I have a lot of work to do. 我必须停笔,因为我有许多工作要做。3)表"正如"、"按照""像......一样",引方式/比较状从。如：Run as l do. （方状从)/My brother is as tall as I am. 我弟弟和我一样高。(比较状从)4)as经常用在as... as possible结构中,表示"尽可能地......"。如：as quickly as possible尽可能快,as much as possible尽可能多。5)表"尽管"、"虽然",常用于倒装句式,引让步状从。如： Old as he was, he still worked very hard. 他虽然年龄大了,但工作还很努力。
2. as用作介词，表"充当"、"作为"。如：As a party member, I must be strict with myself. 作为一名党员,我必须严格要求自己。She is famous as a singer. 她作为一名歌手而闻名。3. as构成一些固定搭配。1)as well as 同,和......一样; 如: My parents often go for a w...很高兴为你解答问题，希望你对学习越来越感兴趣！1. as作连词,引状从。1)表"当......时候",引时状从,强调两个动作同时发生,或某事一发生,另一事立即发生。如：She sang a song as she walked. 她边走边唱着一首歌。2)表"因为"、"由于",引原状从，与because相近。如：I must stop writing, as I have a lot of work to do. 我必须停笔,因为我有许多工作要做。3)表"正如"、"按照""像......一样",引方式/比较状从。如：Run as l do. （方状从)/My brother is as tall as I am. 我弟弟和我一样高。(比较状从)4)as经常用在as... as possible结构中,表示"尽可能地......"。如：as quickly as possible尽可能快,as much as possible尽可能多。5)表"尽管"、"虽然",常用于倒装句式,引让步状从。如： Old as he was, he still worked very hard. 他虽然年龄大了,但工作还很努力。2. as用作介词，表"充当"、"作为"。如：As a party member, I must be strict with myself. 作为一名党员,我必须严格要求自己。She is famous as a singer. 她作为一名歌手而闻名。
3. as构成一些固定搭配。1)as well as 同,和......一样; 如: My parents often go for a walk after supper as well as my brother. 我父母经常晚饭后散步,我哥哥也是。2)as soon as 一......就......如：I will call you as soon as I get to the station. 我一到车站就会给你打电话。3）as long as 只要如：As long asyou don't betray me, I'll do whatever you ask me to (do). 只要你不出卖我，要我做什么我都愿意。
As 用法专练
1.It is generally believed that teaching is ____ it is a science.A. much as an art as B. as much an art as C.an art as much as D.as much as an art。
2. _____ I admire David as a poet,I don’t like him as a man.A.Only if B.If only C. As much D.Much as。
3. ____ ,he talks a lot about his favourite singers after class.A.A quiet student as he may be B.Quiet student as he may be C.Quiet as he may be a student D.As he may be a quiet student。
4.I wonder why you don’t do it as ____ and it’s the third time you have done so.A.told you B. be told C. told to D. you told。
5.( 1) ___I explain on the phone,your request will be considered at the next meeting.(2)____ I explain on the phone is that your request will be considered at the next meeting.A. What B.When C.After D. As。
6.(1)That is ____ problem____can’t be worked out by anyof us .(2)That is ____problem____none of us can work it out.A.a such difficult , that B.so difficult a ,thatC.such a difficult, as D.a so difficult ,as。
7.There were not so many jobs available ____ were asked for.A. that B. which C. what D. as。
8.____ time went on,Einstine’theory_____ right. A. With, proved B As, be proved C.With, be proved D. As, proved。
9.He will surely finish the job on time ____ he’s left to do it in his own way.A.as if B.even if C.so long as D. so that。
10.Scientists generally agree that the earth’s climate will warm up over the next 50 to 100 years____it has warmed in the 20,000 years since Ice Age.A.As long as B.as much as C.as long as D. as well as。
11.Do come to my party,and bring your sister____.A.as good B.as a whole C.as well D.instead。
12.It’s useless trying to argue with the sort of him.You might____ go and stand upon the beach and argue with the sea.A as well B also C.as if D. as well as。
13.(1) We all passed the exam,but ___ him, he alone failed.(2) ____ running, learning English needs will. A. As/as with B. As/as to C.As/as for D.As/as if。
14.I thought things would get better, but ___ it is they were gettting worse.A before B.because C.as D.after。
15.All the gifts must be mailed immediately____ in time for Christmas.A in order to have received B.in order to receivedC.so as to be received D.so as to be receiving。
16(1)Look! The clouds are gathering. It looks as if it ______ (rain).(2)If you put a chopstick into water , it looks as if it _____(break)Answers: 1-4 B D B C 5. DA 6.CB 7-10 D D C B 11-12 C A 13.CA 14-15 C C 16.1)is going to rain 2) were broken
as...as意为"和……一样"，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。其基本结构为：as+ adj./ adv. +as。例如： (1)This film is as interesting as that one.这部电影和那部电影一样有趣。 (2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。 其否定式为not as/so +adj./ adv. +as。例如： This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。 若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。例如： Your bag is twice as expensive as mine.你的袋子比我的贵一倍。 几个关于as...as的常见句型： (1)as...as possible Please answer my question as soon as possible.请尽快回答我的问题。 (2)as...as usual/before She looks as pretty as before.她看起来和以前一样漂亮。 (3)as long as... (引导条件状语从句) It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。 (4)as far as He walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火车站。 (5)as well as She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。 一些带有as...as结构的常见短语归纳： as busy as a bee像蜜蜂一样忙碌 as easy as ABC像ABC一样容易 as deep as a well像井一样深 as light as a feather像羽毛一样轻 as soft as butter像黄油一样软 as rich as a Jew像犹太人一样富裕