As的用法小结只是分享.docx

1、As的用法小结只是分享As的用法小结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为,意思是随着-的

2、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 c

3、ry. 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 sports. 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 pla

4、y. 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。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

5、do. 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 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 i

6、s 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

7、词的用法. 1.表示好像。如:He dressed as a policeman. 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

8、补足语) （四）、作副词的用法 1 表示与-等同。如：This dress 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。一） as作副词，表示程度，意为“同样地”。在“asas”，“not asas”结构中的第一个as是副词，作“和与(不)一样”解。eg： Jack is as tall as his father杰克和他的父亲一样高。 He doesnt speak Engl

9、ish asso fluently as you他的英语说得不如你流利。 二）as作介词。 1作“如，像”解。eg： They got united as one man他们团结得像一个人一样。 2作“充当，作为”解。eg： As a writer，he was famous作为作家，他是很有名的。 三）as作连词，常用来连接主句和状语从句。 1引导时间状语从句，作“当的时候”解，有“随着”之意，与while意义相近，强调两个动作同时发生；或某事一发生，另一事立即发生。eg： He shouted aloud as her ran along他一边往前跑，一边高声地呼喊。 I was star

10、tled as he opened the door他一开门，我吓了一跳。 as作连词，相当于when。eg； As a little boy (When he was a little boy)he began to learn to play piano他小时候就开始学弹钢琴。 2引导原因状语从句，作“因为，由于”解，与because的用法相近。eg； I must stop writing now，as I have rather a lot of work to do我必须停笔了，因为我还有许多工作要做。 3引导方式状语从句或比较状语从句，作“正如，(如)像”解。例eg： As in

11、your country，we grow wheat in the north and rice in the south正如(像)你们国家一样，我们在北方种小麦，在南方种大米。(方式状语从句) When at Rome，do as Romans do入乡随俗。(方式状语从句) 4引导让步状语从句，作“虽然，尽管”解。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。eg； Strange as it may seem，it is true尽管这事看上去很奇怪，但却是真的。 Try as he might，Tom could not get out of the diffic

12、ulties不管怎样努力，汤姆还是摆脱不了困境。 四）as作关系代词。 1引导限制性定语从句，用在“suchas”,“the sameas”，“asas”等结构中，常译作“像一样的人(或物)”，“凡是的人(或物)”。例eg：He wished to be such a man as Lei Feng was他曾希望做一个像雷锋那样的人。 My hometown is no longer the same as it was我的家乡再也不像过去一样了。 2引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以位于句首、句中或句末。eg： As is well

13、known，oceans cover more than 70 of the earth我们知道，海洋占地球面积的百分之七十以上。 五）含as的固定词组的用法 1as soon as作“一就”解，引导时间状语从句。eg： As soon as I get to Beijing，Ill write to you我一到北京，就给你写信。 2asso long as作“只要”解，eg； AsSo long as you study hard，youll make progress只要你努力，你就会取得进步。 3as ifthough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

14、况，则用虚拟语气。eg：She loves the child as ifthough he were her own她爱这个孩子如同爱自己的孩子。 As ifthough也可用来引导表语从句，常用在“It appearslooksseems+as ifthough”句型结构中。eg； It appears as ifthough it is going to clear up看起来天要晴了。 It seems as ifthough he knew nothing about it.他好像对此事一无所知。 4as to作“关于，至于”解。eg；There is no doubt as to

15、his honesty他的诚实是无可置疑的。5as muchmany as作“多达”，“达到之多”解。eg： He can earn as much as 5000 dollars a month他每月能挣5000美元。6soas far as I know作“就我所知”解，在句中作插入语。eg： AsSo far as I know，he will come here next Monday据我所知，他将于下星期一到这里来。 7as a result，as a result of表示“由于的结果”。eg： She died as a direct result of the accident

16、她的死是那次事故的直接结果。 8，as well为“也，还”之意。eg： Come early，and bring your brother as well早点来，把你的弟弟也带来。 9so as to，soas to若跟动词原形，表示目的或结果。eg： He studied hard so as to pass the exam他努力学习以便通过考试。(表示目的)as用法小结 一） as作副词，表示程度，意为“同样地”。在“asas”，“not asas”结构中的第一个as是副词，作“和与(不)一样”解。eg： Jack is as tall as his father杰克和他的父亲一样高。

17、He doesnt speak English asso fluently as you他的英语说得不如你流利。二）as作介词。 1作“如，像”解。eg： They got united as one man他们团结得像一个人一样。 2作“充当，作为”解。eg： As a writer，he was famous作为作家，他是很有名的。 三）as作连词，常用来连接主句和状语从句。 1引导时间状语从句，作“当的时候”解，有“随着”之意，与while意义相近，强调两个动作同时发生；或某事一发生，另一事立即发生。eg： He shouted aloud as her ran along他一边往前跑，

18、一边高声地呼喊。 I was startled as he opened the door他一开门，我吓了一跳。 as作连词，相当于when。eg；As a little boy (When he was a little boy)he began to learn to play piano他小时候就开始学弹钢琴。 2引导原因状语从句，作“因为，由于”解，与because的用法相近。eg； I must stop writing now，as I have rather a lot of work to do我必须停笔了，因为我还有许多工作要做。 3引导方式状语从句或比较状语从句，作“正如，

19、(如)像”解。例eg： As in your country，we grow wheat in the north and rice in the south正如(像)你们国家一样，我们在北方种小麦，在南方种大米。(方式状语从句) When at Rome，do as Romans do入乡随俗。(方式状语从句) 4引导让步状语从句，作“虽然，尽管”解。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。eg； Strange as it may seem，it is true尽管这事看上去很奇怪，但却是真的。 Try as he might，Tom could not get

20、 out of the difficulties不管怎样努力，汤姆还是摆脱不了困境。四）as作关系代词。 1引导限制性定语从句，用在“suchas”,“the sameas”，“asas”等结构中，常译作“像一样的人(或物)”，“凡是的人(或物)”。例eg： He wished to be such a man as Lei Feng was他曾希望做一个像雷锋那样的人。 My hometown is no longer the same as it was我的家乡再也不像过去一样了。2引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以位于句首、句中或句

21、末。eg： As is well known，oceans cover more than 70 of the earth我们知道，海洋占地球面积的百分之七十以上。五）含as的固定词组的用法 1as soon as作“一就”解，引导时间状语从句。eg： As soon as I get to Beijing，Ill write to you我一到北京，就给你写信。 2asso long as作“只要”解，eg； AsSo long as you study hard，youll make progress只要你努力，你就会取得进步。 3as ifthough常用来引导方式状语从句，作“好像，仿

22、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 ifthough he were her own她爱这个孩子如同爱自己的孩子。As ifthough也可用来引导表语从句，常用在“It appearslooksseems+as ifthough”句型结构中。eg；It appears as ifthough it is going to clear up看起来天要晴了。 It seems as ifthough he knew nothing about it.他好像对此事一无所知。 4as to作“关于，至于”解。eg； There is

23、 no doubt as to his honesty他的诚实是无可置疑的。 5as muchmany as作“多达”，“达到之多”解。eg： He can earn as much as 5000 dollars a month他每月能挣5000美元。 6soas far as I know作“就我所知”解，在句中作插入语。eg： AsSo far as I know，he will come here next Monday据我所知，他将于下星期一到这里来。 7as a result，as a result of表示“由于的结果”。eg： She died as a direct resu

24、lt of the accident她的死是那次事故的直接结果。 8，as well为“也，还”之意。eg： Come early，and bring your brother as well早点来，把你的弟弟也带来。9so as to，soas to若跟动词原形，表示目的或结果。eg：He studied hard so as to pass the exam他努力学习以便通过考试。(表示目的)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

25、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

26、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

27、 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像犹太人一样富裕解题过程as + 形容词或

28、副词原级 + as1）在否定句或疑问句中可用so as。He cannot run so/as fast as you.2）当as as 中间有名词时采用以下格式。 as +形容词+ a +单数名词 as + many/much +名词 This is as good an example as the other is. I can carry as much paper as you can.3）用表示倍数的词或其他程度副词做修饰语时，放在as的前面。This room is twice as big as that one.Your room is the same size as mi

29、ne.4) 倍数+ as + adj. + as 倍数+ then + ofThis bridge is three times as long as that one.This bridge is three times the length of that one.Your room is twice as large as mine.Your room is twice the size of mine.necessary+for还是to?一般情况下是+ to,若是表示“对某人有必要的、是必须的”之意，即necessary后面直接跟人称代词，就+ for。 看一些例句就知道了： 1）Sl

30、eep is necessary to health. 睡眠对健康是必要的。 2）Sometimes it is not necessary to go inside in order to buy the hamburgers. 有时候要买汉堡包不需要进入这些餐馆。 3）It is necessary for older people to understand what they think and feel. 年长的人有必要了解年青人在想些什么,他们有什么感觉。“Its +adj.+of+sb.+to do”和 “Its+adj.+for+sb.+to do”区别It is+adj.+of sb. +to do sth中的adj.跟sb.有关, 这个adj.是用来形容sb.的, 表示某人这么做真是太adj.了 你会发现在这个句型中你把sb.和adj.提出来可以造个句sb. is(are) adj. 如Its very kind of you to help me. 把里面的sb.和adj.提出来可以发现you are kind是说得通的. 而It is +adj.+for sb.+to do sth表示做某事对某人来说很adj. 这里的adj.是do sth