英语中常用连词的用法.doc

英语连词的用法 As 一．As 用作连词的用法： 1. as用作连词引导时间状语从句 ①as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，从句的动作可以与主句的动作同时发生，也可以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进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 snowing 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。 ②when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 he was at college, he could speak several foreign languages. When the clock struck twelve, all the lights in the street went out. ③while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. ④但属下列情形时,只用as, 而不用when或while。 A) 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 dances as she sings on the stage. He looked behind from time to time as he went forward. B)表示两个同步发展的动作或行为,译为随着……。如: As time went on / by, she became more and more worried. As children get older, they become more and more interested in the things around them. C)表示两个短促行为或动作几乎同时发生。如: I thought of it just as you opened your mouth. Just as the flying worm hit her face, she g*e a loud cry. D) 后接名词表示某一年龄段时,用as。如: As a young man, he was active in sports. 2. as用作连词引导原因状语从句 ①as，because，since都可以表示因果关系，连接原因状语从句，含义是因为，由于，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，表示多为对方已知的、或稍加分析便可得知的原因。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。 ②as=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 / Since youre not feeling well, you may stay at dangerour place. As/Since he wasnt ready in time, we went without him. 3. as作连词引导让步状语从句 as与although (或though)，however (或no matter how)等都可以引导让步状语从句，含义是虽然，尽管，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，但可以用yet；as所表示的语气较强，引导的让步状语从句用倒装语序,即adj. /adv. / n.+ as +主语+谓语+主句；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