1、1 As Kofi Anna，Secretary General of the United States said，“each contribution - how small - can help make a difference.”2 Now she is spending a year in remote part of southwest China working as a volunteer teacher in a village school.这几个句子都涉及到了 as 的用法。作介词用，第一句话中 as 用作关系代词，引导定语从句，含义为“正如” ，第二句话中 as 的含
2、义为“ 作为，当作”，做介词。下面让我们结合历年高考试题对其用法进行分析。一.用作连词引导让步状语从句从句必须用倒装语序，把作表语用的名词(不加冠词) 或作表语的形容词，或动词( 原形)，或副词提到 as前面。如：1.Child as he is，he knows a lot.2.Tired as they were，they stayed up late preparing for the coming exams.3.Try as he would，he failed again this time.考例：1.(2005 重庆)_，he talks a lot about his favo
3、rite singers after class.A.A quiet student as he may beB.Quiet student as he may beC.Be a quiet student as he may beD.Quiet as he may be a student【解析】答案是 B。作表语的是名词 student，名词前不加冠词。2.(2005.广东)_，Carolina，couldnt get the door open.A.Try as she might B.As she might be C.She might as try D.Might she as t
4、ry【解析】答案是 A。as 引导让步状语，将动词原形 try 提到 as 前面。二.用作关系代词，引导定语从句as 用作关系代词，引导定语从句，含义为“ 正如”。如：1.He is very careful，as his work shows.2.As is known is reported in the newspaper，talks between the two countries are making progress.考例：(2005 浙江)_I explained on the phone，your re quest will be considered at the next
5、 morning.A.When B.After C.As D.Since【解析】答案是 C。意思是“ 正如我在电话里解释的那样 ”。2.(2006)The Beatles，_many of you are old enough to remember，came from Liverpool.A.what B.that C.how D.as【解析】答案是 D。引导非限制性定语从句。三.作为副词用于表示“和一样，”的意思，asas 中间要用形容词/ 副词的原级，如 as long as：长达；as far as远达；as much as：多达；as tall as 含义为“高达”。如：That d
6、ay they walked as far as ten kilometers in two hours.考例：(2005 安徽)John is the tallest boy in the class，_according to himself.A.five foot eight as tall as B.as tall as five foot eight C.as five foot eight tall as D.as tall five foot eight as【解析】选 B.asas 中间要用形容词/副词的原级。四.引导时间状语从句含义为“当 的时候”，如：1.I watched
7、 her as she combed her hair.2.As he grew older ，he lost interest in everything except gardening.考例：1.(NMET1994)Mother was worried because little Alice was ill，especially_Father was away in France.A.as B.that C.during D.if【解析】答案是 A.“在时候”，相当于 when.而 C 选项是介词，不接句子。2.(MET90)_the day went on，the weather got worse.A.With B.Since C.While D.As【解析】答案是 D.“随着” 的意思，as the day went on 可以作为固定结构记住。五.作介词用有“ 作为，当作”的意思。如：1.They were all dressed as clowns.他们都打扮得如小丑。考例：(2005 广东)I feel that one of my main duties_a teacher is to help the students to become better learners.A.for B.by C.as D.with【解析】选 C。“作为教师”的意思。
