as的用法总结

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1、as 可用作连词，引导比较、时间、原因及方式等四种状语从句，应注意的是，引导的比较状语从句往往有省略；引导的时间状语从句一般用一般现在时而不用一般将来时;引导原因状语从句时与“Because”和“since”引导的从句比较起起来语气最弱. as 作介词，意思时“作为”,“以身份”.例如：He came to China as a tourist five years ago. 而表示像一样时，like 通常作介词用，而介词后面通常接名词，代名词和动名词。 as in Australia“和在澳大利亚一样”. asas AS +adj(原级)+AS AS +adv(原级)+AS as soon

2、as 一就 as soon as possible 尽可能快地 as early as possible 尽可能早的 as carefully as you can 尽可能认真地 as careful as you can 尽可能认真的 1.as 是连词，表示“随着”的意义.lives 是 life 的复数，意义是“生活”.BR 2。as 是连词,表示“因为，由于”的意义.wanting 是现在分词,表示主动意义,wanting to buy cars=who want to buy cars。 As 的用法小结 as 可以作连词、介词及关系代词和副词。现将其用法小结如下： （一）、 as 作

3、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。 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?意思是随着-的发展.如： As time went on / by, she became more and more beautif

4、ul . 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)接在名词后面表示某一个年龄段时.如： As a young man， he was active in sp

5、orts。 when 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 2hours。 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发生。如:Work while you work。 Play while you play。 2. As =Since 作既然、”由于”解，引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由

6、。如： As hes been ill for ages, I will help him. As / Since youre not feeling well， you may stay at home。 As he wasnt 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. 4。 用于 as- as 或 not / so/ as - as 中，前一个 as 是副词,后

7、一个 as 是连词，引导比较状语从句。如:They helped the old as much as possible. I dont 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： Young as he is, he knows much. Tired as they were， they walked on. 6。 表示也-一样。 She is a doctor， as was her husband. （二）、 as 作关系

8、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 wellknown, Taiwan belongs to China。 另外,当先行词被 the same, such 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. I was reading the same book as he bought yesterday。 （三）、as 作介词的用法。 1.表示好像。如:He dressed as a policem

9、an. 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, Ill 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 1 表示与-等同。如：This dre

10、ss is twice as expensive as that one. 2 像，如等。如：As before， he remained unmoved. 总之,通过以上的分析，我们对 as 的词性和用法有了比较全面的理解和把握，才能在实际的运用中做到心中有数,应付裕如。 常见词 as 用法总结 近几年高考中有关 as 一词的题目出现过很多次， 其中 as 或是最佳选项，或是干扰项，或是题干中的关键信息点，涉及 as 作为连词、介词、关系代词、副词以及习语等各种用法。现结合高考试题将 as 的用法归纳如下: 一、 用作连词的 as 1. 引导时间状语从句,表示“当的时候”， 其用法与when

11、和while类似.例如： As a child （When he was a child)， she was sent to six different schools. 此用法中 as 多表示从句与主句动作同时进行,一般不与状态动词连用，意为“一边一边。例如：She sang songs as she did her homework. as 还可以表示一动作紧接着另一动作发生,说明另一动作的结果，有“随着的含义。例如:As time went by， we found he was an honest man。/As he grew older, he lost interest in e

12、verything except gardening。 例 1 It wasnt until nearly a month later_ I received the managers reply。 A。 since B。 when C。 as D. that 解析： 本题中的 as 与 when 一起作为干扰项,容易使同学往时间状语从句上思考，事实上本题是强调句，正确选项是 D。 2. 引导原因状语从句，表示“由于，因为，相当于 because, 但通常置于句首。例如:As he is a qualified doctor, I trust his advice on medical mat

13、ters. 例 2 _ modeling business is by no means easy to get into， the good model will always be in demand。 A。 While B。 Since C。 As D。 If 解析：本题中 as 干扰性很强，很多同学误以为是原因状语从句,但仔细分析不难发现正确答案应是 A（while 表示“只要”）。 3。 引导让步状语从句，通常可与 although 或 though 通用,但语序不同，although 或 though 用于句首，as 用于倒装结构。例如:Young as I am, I alrea

14、dy know what career I want to follow。 /Although（或 Though）I am young, I already know what career I want to follow。 as 表示让步用于倒装结构，通常将从句的表语、状语或动词前置。如果表语有冠词 a/an, 需去掉。 例如： Great scholar as he is， he is lacking in common sense。 /Much as I like you, I couldnt live with you。 / Try as he would, he couldnt o

15、pen the door。 例 3 _ he has limited technical knowledge， the older worker has a lot of experience. A。 Since B. Unless C. As D. Although 解析： as 虽然有引导让步状语从句的用法， 但本题不是倒装结构，故正确答案应是 D. 4. 引导方式状语从句，表示“如,像。例如:When in Rome， do as Romans do。/Do to others as you would have others do to you。 例 4 We wanted to ge

16、t home before dark, but it didnt quite _ as planned。 A。 make out B. turn out C. go on D。 come up 解析： 本题考查动词词组辨析，题干中的“as planned”提供了重要信息，答案选 B。 5. 固定句型：“主句，as +be/do+主语”表示“也一样。例如：Shes unusually tall, as are both her parents./Hes a doctor， as was his wife before she had children。 二、 用作介词的 as 1。 表示“如,像

17、”。 例如： They got united as one man。 /She spoke of me as her dearest friend. 2。 表示“作为，当作”.例如：As a League member, you should think more of others。/After graduating from the college, he firstly worked as a clerk in a big company. 3. 与某些动词搭配， 表示“把当作”,如： look on。 .as。 。 。 , regard.。.as.。, treat。.。as。., co

18、nsider。.as。， think of.as.。， see. 。.as。.等。其中 consider.。as。中的 as 可以省略。as 与 famous或 known 搭配，表示“作为而出名”. 例 5 Linda worked for the Minnesota Manufacturing and Mining Company, _ as 3M。 A. knowing B. known C. being known D。 to be known 解析: 如果熟悉 be known as 这一短语，运用有关非谓语动词的常识，就可选出正确答案 B。 三、 用作关系代词的 as 1。 引导限

19、制性定语从句，先行词前通常有 as， so, such, same 等修饰语。 例如： He will marry as pretty a girl as he can find。 /My hometown is no longer the same as it used to be./As many people as are present will be given a present。在此种用法中，同学们要注意与结果状语从句的区别。比如： The teacher asked us such a difficult question that none of us could answe

20、r it. The teacher asked us such a difficult question as none of us could answer。句为结果状语从句，而句则是定语从句。 2。 引导非限制性定语从句，用来指代整个主句（即先行句）,表示“这一事实,那一情况”。从句可以位于句首、句中或句末。例如:We stand when the national anthem is played， as is the custom。 例 6 _ I explained on the telephone， your request will be considered at the ne

21、xt meeting. A。 When B。 After C. As D. Since 解析： 根据句意,选项 C 是正确答案。 这里 as 体现的正是本点所讲用法。 例 7 _ is our belief that improvements in health care will lead to a stronger, more prosperous economy. A。 As B。 That C. This D. It 解析： 本题中的 as 项干扰性很强，容易误选。实际上，句中 that引导的应是真正的主语从句，it 充当形式主语，故选 D。如果将题干中的 that 换为逗号,则必须选

22、 as. 例 8 Danby left word with my secretary _ he would call again in the afternoon。 A。 who B。 that C. as D. which 解析: that 引导的从句是 word 的同位语,本题应选 B。as 无此用法,在这里起干扰作用。 四、 用作副词的 as 修饰形容词或副词，表示程度，意为“同样地”.例如：He swims fast， but I swim just as fast. 但它通常构成表示比较的结构 as。 。 .as.。 .,not as.。as.。此结构中第一个 as 是副词，第二个

23、as 是连词。否定结构中的副词 as 可以由 so 代替。as.as possible 和 as。as one can 也属于这种用法。例如：It is generally believed that teaching is as much an art as it is a science./The movie was not as good as I had expected。/I play tennis as well as him。 五、 用在习语中的 as 由 as 构成的习语很多，常见的有：as soon as “一就”，引导时间状语从句；as(或 so） long as “只要，

24、引导条件状语从句；as if/though “好像，仿佛”，引导方式状语从句或表语从句；as to（或 as for） “至于，就而言”； as much(或 many） as“多达”； as （或 so） far as “就的限度”；as a result of “（由于的）结果”；as a matter of fact“事实上”；as well “也,还；A as well as B“不但 A 而且 B”;as it is“照现状看，看样子”，等等。这些习语在高考中出现频率较高,有的作为正确选项,有的作为干扰项，有的出现在题干。例如： 例 9 I would like a job whic

25、h pays more， but _ I enjoy the work Im doing at the moment. A。 in other words B. on the other hand C. for one thing D. as a matter of fact 解析： 选项 D 极具干扰意义，进一步研读会发现本题中的两个分句表达了一件事的两个对立面，故选 B. 例 10 People should stop using their cars and start using public transport. _. The roads are too crowded as it

26、is. A。 All right B. Exactly C。 Go ahead D. Fine 解析： 本题的 as 没有出现在选项中，但题干中的 as it is 是解题的关键信息，正确选项为 B。 例 11 Maggie has been fortunate to find a job she loves and, _， she gets well paid for it。 A. sooner or later B. whats more C。 as a result D. more or less 解析： 本题的后一个分句不表示结果,而是递进,故选 B 而不是 C。 例 12 The w

27、inter of 1990 was extremely bad。 _ most people say it was the worst winter of their lives。 A。 At last B. In fact C。 In a word D. As a result 解析: 选项 D 起干扰作用，正确选项为 B。 以上总结的是 as 一词在教材中出现的主要用法及在高考卷中的具体应用，可以看出它词性多,词义广,用法灵活。同学们在复习中一定要理清思路，抓住重点,应用时仔细分析上下文，弄清逻辑关系，才能作出正确选择。 关系代词作定语从句主语时的省略 关系代词在定语从句中除作宾语可以省略

28、外,在下列情况下，作主语也可以省略。 1定语从句中含 there be,作定语从句主语的关系代词可以省略。 You must make a list of the names of the students there are in your class 你必须列一张你班同学的名单. He showed me the difference there is between what is right and what is wrong 他给我指出了对和错的不同之处。 2主句以 there be 开始,作定语从句主语的关系代词可以省略。 There is something keeps worr

29、ying me 有些事一直使我担心。 There is a teacher here can speak Spanish 这里有一位老师能说西班牙语。 3主句以 that iswas 开始的句子中，作定语从句主语的关系代词可以省略。 Thats all is todays homework 今天的家庭作业就是这些。(all 后省去 that） Was that someone posted your letter？ 是有人帮你把信寄走了吗？(someone 后省去 that) 4主句以 here is，here are 开始,作定语从句主语的关系代词可以省略。 Here is the prof

30、essor comes from the Oxford University 这是从牛津大学来的一位教授。(professor 后省去 who） Here are three or four of us got a full mark in the examination 我们这里三四个人考试得了满分.（us 后省去 who) 5主语以 have（意思是“有”）作谓语，作定语从句主语的关系代词可以省略.如： I have two more people should come to help me 我还有两个人应该来帮助我。（people 后省去 who） We have words to s

31、peak to those people will be put to do the work 我还有话要对派去做这工作的人说。（people 后省去 who） 英语关系代词作定语从句主语省略的情况常见之于口语和非正式英语，对我们作为非本族语言的人来说应该慎用。但是了解这种省略情况是完全必要的,因为这会有助于我们识别和理解这种语言现象，提高我们的英语阅读能力和欣赏水平。 独立主格 由一个名词或代词作为逻辑主语，加上一个分词、形容词、副词、动词不定式或介词短语作为逻辑谓语构成,这种结构在形式上与主句没有关系,通常被称为独立主格结构。 （一）独立主格结构的构成: 名词(代词)+现在分词、过去分词

32、名词(代词）+形容词 名词(代词)+副词 名词(代词)+不定式 名词(代词） +介词短语构成 独立主格结构主要起状语作用,相当于一个状语从句,多用来表示行为、方式、伴随等情况,有时也可用来表示时间、原因、条件等情况。 1、名词或代词主格 + 分词 The experiment done, the students went on to take notes in the experiment report。 实验做完了,同学们继续在实验报告上做记录。 Time permitting, we can have a walk around the playground after supper.

33、如果时间允许，晚饭后我们可以到操场上散步。 2、名词或代词主格 + 形容词 Computers very small， we can use them widely。 电脑虽小，我们却能广泛地利用它们。 The clothes very dirty， youd better wash them quickly。 衣服很脏，你快点儿洗洗吧！ 3、名词或代词主格 + 不定式 The last guest to arrive， our party was started. 最后一位客人到了，我们的晚会就开始了。 4、名词或代词主格 + 介词短语 Our English teacher came into the classroom, papers in hand。 我们的英语老师走进了教室,手里拿着试卷. There is a river in the valley, fresh flowers on the banks。 山谷中有一条河,河两岸长满了鲜花. 5、名词或代词主格 + 副词 The meeting over, our headmaster soon left the meetingroom. 散会了,校长很快就离开了会议室。 The lights off， we could not go on with the work. 灯熄了,我们不能继续工作了。