高三英语：as和while专题

1、as和while专题英语中as的用法归纳一、as作连词的用法1. as.as的用法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 yo

2、u 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。as . as的基本用法1) as + adj. / adv. + as 和一样 2) as many / much as sb. want(s) 想要多少就有多少3) as + adj. / adv. + as possible / as one can 尽可能4) as many / much / far, etc. + as

3、+ （数字） 多 / 远达5) . percent as + adj. + as 是的百分之6) half as + adj. + as 是的一半7) A is n times as . as B. A是B的几倍 / A比B大n?鄄1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/beforeShe 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

4、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 asShe 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 wel

5、l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2. as用作连词引导时间状语从句as与when，while都是引导时间状语从句的从属连词，含义都是当的时候。但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用as时，主句和从句的动作同时发生，具有延续的含义。例如：(1)It was snowing when he arrived at the constru

6、ction site.他到达工地时，天正在下雪。(2)He was watching TV while his mother was cooking.他母亲做饭时他在看电视。(3) You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。3. as用作连词引导原因状语从句as，because，since都可以表示因果关系，连接原因状语从句，含义是因为，由于，但它们有区别：because表示的语气最强；as一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作既然。例如：(1) H

7、e will succeed because he is in earnest.他一定会成功，因为他很认真。(2) Since you are so sure of it he”ll believe you.既然你对此如此有把握，他会相信你的。(3) As rain has fallen, the air is cooler.因为下过雨，空气比较清爽。4. as作连词引导让步状语从句as与although (或though)，however (或no matter how)等都可以引导让步状语从句，含义是虽然，尽管，但它们有区别：although语气稍正式些，可放在句首，也可放在句中，主句中不

8、能再用but，但可以用yet；as所表示的语气较强，引导的让步状语从句用倒装语序；however引导让步状语从句时，它的后面可跟形容词或副词，也要用倒装语序。例如：(1) Although he is quite old, he still jogs every day.他虽然年纪相当大，仍然每天慢跑。(2) Strange as it may seem, nobody was injured in the accident.这次意外虽然显得令人不可思议，却没有人受伤。(3) However hard he may try, he will not attain his goal.无论他怎样努

9、力也达不到目标。二、as作关系代词的用法关系代词as引导定语从句时，既可以单独使用，也可以与其他词连用，其用法要比that和which更为复杂。1. as引导定语从句与其他词连用用于the same.as结构中This is the same book as I read last week.这本书和我上周读的那本是一样的。用于such.as结构中I don”t like such books as he recommends.我不喜欢他推荐的那些书。用于so +adj. + a/an + n. (单数) + as 结构中I am not so strong a man as I was.我已

10、经没有从前那么强壮了。2. as单独引导定语从句as单独引导定语从句时，先行词可以是一个词，也可以是一个句子或短语。例如：(1) She is late, as is often the case.她迟到了，这是经常的事。(先行词是整个主句)(2) To shut your eyes to facts, as many of you do, is foolish.对事实视而不见-你们好多人都是如此的愚蠢。(先行词是不定式短语)三、as作介词的用法as作介词，意思是作为，以身份。例如：He came to China as a tourist five years ago.他五年前以游客的身份来

11、过中国。四、as作副词的用法to the same degree or amount; equally 相同地，同样地。例如：They don”t have as many airplanes.他们没有同样多的飞机。【考例1】 Our neighbour has _ ours.（北京2003）A. as a big house as B. as big a house as C. the same big house as D. a house the same big as【考例2】 What a table! Ive never seen such a thing before. It i

12、s _ it is long.A. half not as wide as B. wide not as half asC. not half as wide as D. as wide as not half【考例3】 Id like to arrive 20 minutes early _ I can have time for a cup of tea. (北京2005)A. as soon as B. as a result C. in case D. so that【考例4】 The more I think about him, the more reasons I find fo

13、r loving him _ I did.（湖南2005）A. as much as B. as long as C. as soon as D. as far as 【考例5】 John is the tallest boy in the class, _ according to himself. (安徽 2005)A. five foot eight as tall as B. as tall as five foot eightC. as five foot eight tall as D. as tall five foot eight as【考例6】 Did you take en

14、ough money with you? No. I needed _ I thought I would.（2006全国II）A. not so much as B. as much as C. much more than D. much less thanKey: 1-3 BCD 4-6 ABC英语中连词while的用法归纳连词while除具有“当时”、“同时”等意义外，根据上下文还有以下不同含义及其不同译法。 一、引导时间状语从句译作“当时”。例如：1. Make hay while the sun shines. 趁着有太阳晒晒草。 （乘机行事，抓紧时机。）2. We must wo

15、rk hard to gain more knowledge while we are young.趁着现在还年轻，我们必须刻苦学习，获得更多的知识。二、引导让步状语从句常放在句首，译作“尽管”、“虽然”，比although或 though语气要轻。例如：1. While I believe it is true, I cannot prove it.虽然我相信那是真的，但我无法证明。2. While any kind of athletic shoe can provide a certain amount of rebound,energy-return sneakers are desi

16、gned to maximize this effect.虽然任何一种运动鞋都能提供一定的反弹力，但回力运动鞋能够使这种效果最大化。三、引导条件状语从句相当于as long as，译作“只要”。例如：1. While there is life, there is hope.有生命，就有希望。2. While a spark of life remains, it is a doctors duty to save the patient.只要病人还有一息生机，医生就有责任挽救。四、引导原因状语从句相当于since， 有“既然”的意思。例如：1. Youll never save any mo

17、ney while youre so extravagant.你这么奢侈，永远存不下钱来。2. Id like to get it settled today while were at it.既然我们着手干了，我想今天就把它干完。五、连接并列句表示对比，相当于whereas，译作“而”、“可是”。例如：1. An outdoors man will soon become pale if he changes to an indoor job, while a desk clerk will take on a tan after a short vacation in the sun.从事

18、室外工作的人如果调到室内工作，不久肤色就会变白；而一个伏案工作的文员出去度个短假，就会被太阳变黑。2. Motion is absolute while stagnation is relative.运动是绝对的，而静止是相对的。六、连接并列句表示递进，相当于and what is more, 译作“并且”、“而且”。例如：1. The new man-made fibres are more hardwearing than natural fibres and greatly reduce mending, while good ready-made clothes are cheap a

19、nd plentiful.新的人造纤维比天然纤维耐磨，因此能大大减少修补工作，而且做好的衣服价廉物美，数量也多。2. Of course, I resolutely determined not to marry, while I quite forgot to consider at all that great rock of disaster in the working-class world- sickness.当然, 我下定决心不结婚，而且把工人阶级的巨大灾难疾病，也忘得一干二净。高考英语考查连词while的四个关键考点连词while是高考一个命题的热点（每年必考），你知道其考点主

20、要涉及哪些方面吗？一、考查表示时间的用法，其意为“当的时候”。如：We must strike while the iron is hot. 我们要趁热打铁。 Stand still while I take your photograph. 我给你拍照时站着不要动。Have we got enough books to read while we are on holiday? 假期里我们有足够的书看吗?Were there any calls for me while I was out? 我出去的时候，有人来过电话吗? She hates anyone listening while s

21、he is telephoning. 她打电话时不愿让任何人听。二、考查表示让步的用法，其意为“尽管”“虽然”。如：While the work was difficult, it was interesting. 虽然工作有难度，但很有趣。 While I understand what you say, I cant agree with you. 虽然我理解你的意思，但我还是不同意。三、考查表示对比的用法，其意为“而”“但”。如：Some people waste food while others havent enough. 一些人糟踏食物而另一些人却食不果腹。I went swim

22、ming while the others played tennis. 我去游泳，而其余的人则去打网球了。Prices are rising sharply, while incomes are lagging far behind. 物价飞涨而收入却远远落后。注：这样用时，while引出的句子通常位于末，但有时也可位于句首。如：While most children learn to read easily, some need extra help. 大多数儿童学会阅读很容易，有一些儿童却需要特别帮助。While Deauville is a holiday resort, Trouvi

23、lle is more of a working town. 特维尔是个度假胜地，而特鲁维尔更多的却是个工业城市。四、考查其省略用法，即主句与从句主语相同，且从句谓语动词含有动词be时，通常可省略从句主语和动词be。如：While (he was) in prison, she wrote her first novel. 她在狱中写出了第一部小说。 He had strayed from home while still a boy. 他小时候就离开家到处流浪了。 He fell asleep while (he was) doing his homework. 他做着做着功课就睡着了。I

24、was only listening to the radio with half an ear, while (I was) preparing some food. 我正在做吃的东西，没太留心听收音机。【考点实训】01. She just sits there reading her story book, _ I do all the work. A. until B. while B. because D. though02. Their economy has expanded enormously, _ ours, by contrast, has declined. A. whi

25、le B. unless B. in case D. which03. Could you watch my bags for me, _ I go to the toilet? A. though B. unless B. what D. while04. The professor is typing his own letters _ his secretary is ill. A. what B. which B. if D. while05. She said she was going to the shops and asked me whether I wanted anyth

26、ing _ she was out. A. though B. while B. which D. before06. Tea is the most popular drink, _coffee comes second. A. since B. until B. what D. while07. Schools in the north tend to be better equipped, _ those in the south are relatively poor. A. since B. before B. while D. because08. It is no accident that men