中考网整理了关于2021中考英语连词要点之常用连词的使用方法辨析，期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，但使用方法有所不同。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。比如：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，最常见的是while。比如：While mother was cooking lunch, I was doing my homework.3）当两个动作都表示进步变化的状况时，最常见的是as。比如：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。比如：Just as he caught the fly, he gave a loud cry.She looked behind from time to time as she went5）当从句的动作先于主句的动作时，一般用when。比如：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，一般用when。比如：When John arrived I was cooking lunch.（2）as, because, since , for这四个词都可表缘由，但使用方法有不同。1）假如缘由构成句子的最主要部分，一般用because。因此，because引导的从句总是放在句末。比如：I stayed at home because it rained.---Why arent you going?---Because I dont want to.2）假如缘由已让人们所知，或不如句子的其它部分要紧，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。比如：As he wasnt ready, we left without him.Since I have no money, I cant 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。比如：I decided to sTOP and have lunch----for I was feeling quite hungry.www.zhongkao5.com//（3）if, whetherif和whether都可作是不是讲，在引导宾与从句是一般可互换。比如：I wonder whether （if） you still study in that school.I dont know whether （if） he likes that film.在下列状况下，只可以用whether,不可以用if：
1）引导主语从句时。比如：Whether he will come to the party is unknown.2）引导表语从句时。比如：The question is whether I can pass the exam.3）在不定式前。比如：I havent made up my mind whether to go there or not.（4）sothat, suchthat1）sothat中的so是个副词，其后只能跟形容词或副词，而suchthat中的such是个形容词，后接名词或名词短语。比如：Im so tired that I cant walk any farther.It was such a warm day that he went swimming.2）假如在名词之前有many, much, little, few时，用so,不需要such。比如：He has so little education that he is unable to get a job.I have had so many falls that I am black and blue all over.（5）eitheror， neithernor, not onlybut also这三个连词词组都可连接两个并列成分。当它们连接两个并列主语时，谓语动词要随相邻的主语变化。比如：Either you or he is wrong.Neither he nor his children like fish.Not only the teacher but also the students want to buy the book.（6）although, but这两个连词不可以用在同一个句子中。比如：大家不可以说Although he isover sixty, but he works as hard as others.这个句子应改为：Although he is over sixty, he works as hard as others.或He is over sixty, but he works as hard as others.（7）because, so这两个连词同样不可以用在同一个句子中。比如：大家不可以说Because Johnwas ill, so I took him to the doctor. 这个句子应改为Because John was ill, I took him to the doctor.或John was ill, so I took him to the doctor.
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