as的用法归纳

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1、as的用法作一个归纳。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 you t

2、hink.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

3、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 AB

4、C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 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,从句的动作能够与主句的动作同时发生,也能够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实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 snowin

5、g when he arrived at the construction 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都能够表示因果关系,连接原因状语从句,含义是因为,因为,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

6、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) He 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)等都能够引导让步状语从句,含义是虽然,即

7、使,但它们有区别:although语气稍正式些,可放在句首,也可放在句中,主句中不能再用but,但能够用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

8、 may try, he will not attain his goal.无论他怎样努力也达不到目标。 二、as作关系代词的用法 关系代词as引导定语从句时,既能够单独使用,也能够与其他词连用,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 +

9、n. (单数) + as 结构中 I am not so strong a man as I was.我已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,先行词能够是一个词,也能够是一个句子或短语。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。

10、例如: He came to China as a tourist five years ago.他五年前以游客的身份来过中国。 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。在中学英语课本中, as 多次出现。它的含义较多,且用法灵活。现将其用法分析归纳如下: 1. as 作为副词,常与连词 as 连用,意为“和一样”。例如: as easy as ABC (非常容易), as cool as cucumber (沉着的), a

11、s stubborn as a mule (非常顽强的,倔强的), as clear as crystal (非常透明的), as poor as a church mouse (非常贫困的), as busy as a bee (非常繁忙的)。在这些短语中,第一个 as 是副词,第二个 as 是连。在否定句中,作副词用的 as 能够用 so 代替。例如: Its not so easy as I thought. (这不像我想的那么容易。) 2. as 作为连词,其意义和用法主要有: ( 1 )意为“当之时”,引导时间状语从句,在意思上相当于 when 和 while 引导的时间状语从句。例

12、如: As he grew up, he became silent. (他长大以后,变得沉默寡言。) ( 2 ) 意为“既然,因为”,引导原因状语从句,不过它引导的原因状语从句时所表示的原因不如 because 引导的从句所表示的原因那么直接和强烈。试比较: As he wasnt ready, we went without him. (既然他没有准备好,我们就自己去了。) Because he was ill, he couldnt go to school. (因为他病了,所以不能去上学。)(原因状语从句表示“不能去上学”的直接原因) ( 3 ) 意为“虽然,即使”,引导让步状语从句,

13、在意思上相当于 although 引导的从句。 as 引导让步状语从句时,常以下列句式出现:名词 / 副词 / 动词 (原形) / 形容词 +as+ 主语 + 其他成分。例如: Child as he is ( =Although he is a child ) , he can speak English. (即使他是个孩子,他却能讲英语。) Young as you are ( =Although you are young ) , you can do it very well. (虽然你年轻,但你却能做得很好。) Much as I like it , Ill not buy it.

14、(虽然我很喜欢它,我也不会买。) Try as he may, he has little hope to win. (即使他会尽力,但取胜的希望却很小。) ( 4 ) 意为“如,像”,引导方式状语从句。例如: You must do as I tell you . (你必须按照我告诉你的那样去做。) ( 5 ) 意为“作为(某种身份),当做,视为”。例如: As a student, you must obey the rules. (作为学生,你必须遵守纪律。 ) 3. as 作介词,意为“如同,作为”。例如: Unite as one man. (团结得像一个人。) as 还能够用于 r

15、egard , view , treat , acknowledge 及类似意义的动词之后,构成固定搭配。例如: Most of us regard him as a kind man. (我们绝大部分人认为他是个好心人。) We treat them as our friends. (我们把他们当作朋友。) 4. as 用作关系代词,引导非限制性定语从句,并在从句中充当主语、宾语或表语等,有“正如”或“据”的意思;它所引导的从句位置较灵活,能够位于句首、句中或句末。例如: As we know from his accent, he is from Shanghai. (正如我们从他的口音中所知道的,他来自上海。)(从句位于句首) Mary, as we had expected, passed the exam. (正如我们所预料到的,玛丽通过了考试。)(从句位于句中) as 还能够引导限制性定语从句。若先行词被 the same , such 修饰,关系代词应用 as .例如: This is such an i

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