as的词性和用法大全讲义--高三英语一轮复习.docx

as的用法总结一、as作为介词的用法：1. “好像”；2. “作为”，“当作”；3.表示某身份。 She dressed as an angel.I found a job as a guide.As a child , she was sent to abroad.二、as作为副词的用法：1.意思为“相同地”，“ 同样地”；2.意思为“像，如”等。 This dress is twice as expensive as that one.As before/usual, he remained unmoved.三、as作为从属连词，可以引导下列从句：1、as引导时间状语从句，意为“正当的时候”、“一面一面”、“随着”。As time goes on, it's getting warmer and warmer.You will grow wiser as you grow older.2、as引导原因状语从句，意为“由于”。As this question is of great importance, we will discuss it once again.Water, as it occurs in nature, is never very pure.We couldnt send the children to school as life was very hard in those days.3、 方式状语从句，意为“如同”、“按照的方式、样子、办法”。You must try to hold the tool as I do. Leave things as they are. 4、as引导让步状语从句，意为“虽然”，多在主句之前，且多用倒装。（应将从句主要成分的形容词、副词、原形动词、不加冠词的单数名词置于as 前面）Difficult as it is, we should not give it up.Child as he is, he knows something about electricity.Strange as it may seem, nobody was injured in the accident.Try as he may, he never succeeds.5、as引导比较状语从句，意为“和一样/不一样”。 其基本结构为：as+ adj./ adv. +asThis film is as interesting as that one.Your pen writes as smoothly as mine.注意：其否定式为not as/so +adj./ adv. +asThis dictionary is not as/so useful as you think.【知识拓展1】：几个关于as.as的常见句型：(1)as.as possible（尽可能.）Please answer my question as soon as possible.(2)as.as usual/before(和平常/之前一样)She looks as pretty as before.(3)as long as. (只要.)It took us as long as three years to carry out the plan.(4)as far as (远至；直到.)He walked as far as the railway station yesterday evening.(5)as well as（和.一样）She cooks as well as her mother does.（6） as soon as（一.就.）I'll call you as soon as I get home.另外：might as well(不妨不如)You might as well have a try.【知识拓展2】：一些带有as.as结构的常见短语归纳：as busy as a bee忙忙碌碌    as easy as ABC 非常简单as deep as a well高深莫测      as light as a feather轻如鸿毛as soft as butter非常柔软     as rich as a Jew非常富裕as strong as a horse健壮如牛     as poor as a church mouse一贫如洗as cool as a cucumber镇定自若四、as作为关系代词，可以引导定语从句，既可以单独使用，也可以与其他词连用，而且as在定语从句中可以充当主语、宾语、介词宾语、表语，可以指人也可指物。1、引导限制性定从句。 用于the same.as结构中。He isnt the same person as he used to be.用于such.as结构中。I have never heard such story as he is telling.用于"as/so +adj. + a/an + n. (单数) + as "结构中I am not so strong a man as I was.2、 引导非限制性定从句，修饰整个主句或主句的一部分，可在句首、句中、句末。As is often the case, we have overfull filled the production plan.This machine, as might be expected, has stopped operating.She is late, as is often the case.(先行词是整个主句)To shut your eyes to facts, as many of you do, is foolish.(先行词是不定式短语)此外还有: as has been said before（正如先前所说）as may be imagined （正如所想）as has already been pointed out （正如早就指出的）as is well known（众所周知）as we all can see（正如所见）as was expected（正如所料）as often happens（这是常有的事）as some one put it（正如某人所讲）as you can imagine（正如你能想象的） 学科网（北京）股份有限公司