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中考网整理了关于2021中考英语连词知识点之常用连词的用法辨析，希望对同学们有所帮助，仅供参考。 （1）while, when, as 这三个连词都可引导时间状语从句，但用法有所不同。 1）当某事正在进行的时候，又发生了另一件事。While, when, as 都可用来引导表示“背景”的时间状语从句。例如： As/When/While I was walking down the street I noticed a police car. 2）当两个长动作同时进行的时候，最常用的是while。例如： While mother was cooking lunch, I was doing my homework. 3）当两个动作都表示发展变化的情况时，最常用的是as。例如： As children get older, they become more and more interested in things around them. 4）当两个短动作同时发生时，或表示“一边…一边…”时，最常用as。例如： Just as he caught the fly, he gave a loud cry. She looked behind from time to time as she went 5）当从句的动作先于主句的动作时，通常用when。例如： When he finished his work, he took a short rest. 6）当从句是瞬间动作，主句是延续性动作时，通常用when。例如： When John arrived I was cooking lunch. （2）as, because, since , for 这四个词都可表原因，但用法有区别。 1）如果原因构成句子的最主要部分，一般用because。因此，because引导的从句往往放在句末。例如： I stayed at home because it rained. ---Why aren’t you going? ---Because I don’t want to. 2）如果原因已被人们所知，或不如句子的其它部分重要，就用as或since。Since比as稍微正式一点。As和since 引导的从句一般放在句子的开头。例如： As he wasn’t ready, we left without him. Since I have no money, I can’t buy any food. 3）for用来补充说明一种理由，因此，for引导的从句几乎可以放在括号里。For引导的句子不放在句子的开头。例如： I decided to stop and have lunch----for I was feeling quite hungry.www.zhongkao5.com// （3）if, whether if和whether都可作“是否”讲，在引导宾与从句是一般可互换。例如： I wonder whether （if） you still study in that school. I don’t know whether （if） he likes that film. 在下列情况下，只能用whether,不能用if： (责任编辑：admin) |