从属连词课件--高考英语二轮复习.pptx

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1、考点解读牛刀小试专题 从属连词连词的分类连词的分类 从属连词：从属连词引导名词性从句：that,whether,if三个。其中that 和whether间或还可以引起同位从句和状语从句引导时间状语从句：after,before,when,as,while,since,until,till,as soon as 引导原因状语从句的：because,since,as引导让步状语从句的：although,though,no matter（无论）,even if(though)引导条件状语从句的：if,unless,once,so(as)long as 引导结果状语从句的：so that,such t

2、hat 引导目的状语从句的：so that,in order that 引导比较状语从句的：as as,not so(as)as,than 引导方式状语从句的：as if。从属连词复合句中引导从句的连结词名词性从句名词性从句thatthatThe problem is that we havent got enough money.问题是我们没有足够的钱。whether/if whether/if 是否是否Do you know whether/if the museum is open on Sunday?博物馆星期天是否开门，你知道吗?从属连词从属连词牛刀小试牛刀小试 It is not

3、yet known_.(机器人是否有一天能拥有像人一样的视力).【解析】whether/if robots will one day have vision as good as human vision.本题考查it作形式主语,whether/if引导后置的主语从句。同时考查as.as.，“像.一样”结构的使用。whilewhile引导的状语从句中动词必须是持续性。谓语动词多为进行时，或状态动词的一般时。while 的这些用法可用when代替，等于“at the time that”,“during the time that”。Please keep quiet while(when)ot

4、hers are studying.别人学习时，请保持安静;while,when,aswhile,when,as when可指一段时间外/指一点时间，等于“at the time”，（动词可以是终止性的，也可以延续性的）。因此主句和从句的谓语可以是一般时，进行时，或完成时。When I went into the lab,the teacher was doing an experiment.当我走进实验室时，老师正在做实验。（when不能换成while）He often makes mistakes when he is speaking English.他说英语时经常出错。（when可换成

5、while）while,when,aswhile,when,aswhile,when,aswhile,when,aswhenwhen引导的状语从句中的主语与主句主语一致，主、谓是“主语+系动词”结构时，这时主语和系动词可以省略。When(he was)young,he worked for a rich man.当他年轻时，他为富人工作。whenwhen有时代替if，引导条件句，意为“如果”、“假如”，例如：Ill come when(if)Im free.我一有空就来。asas常可与when，while通用，但强调“一边、一边”。As(when,while)I was walking dow

6、n the street,I noticed a police car in front of the bakery.当我在街上走的时候，我注意到面包店前有一辆警车。while,when,aswhile,when,as牛刀小试牛刀小试I felt somewhat disappointed and was about to leave,_something occurred which attracted my attention.A.Unless B.until C.when D.while【答案】C.【解析】表示当某事正在进行行时，另一事件突然发生，这时when往往放在另一句子的后面,相当

7、于at that time。while多用于延续性或同时性动作，但此句的主句与从句相关的动作分别为leave和occur，均为短暂性动作，不用while，故选C。作连词一般表示时间，意为作连词一般表示时间，意为“在在之前之前”.试看以下句子的翻译：试看以下句子的翻译：He almost knocked me down before he saw me.他几乎把我撞倒才才看见我。Before I could get in a word he had measured me.我还没来得及没来得及插话，他已经给我量好了尺寸。beforebefore用于否定句时，结构为not until(till)，

8、主句谓语动词延续与非延续皆可，意为“直到才”。用于肯定句时，只与延续性动词连用，表示“到为止”。They played volleyball until(till)it got dark.他们打排球一直打到天黑。They didnt talk（延续性动词）until(till)the interpreter came.直到翻译来了，他们才说话。He did nt go to bed（非延续性动词）until(till)the his father came back.直到他父亲回来，他才去睡觉。till,untiltill,untiluntil可以放在句首，till则不行。Until the

9、last minute of the match we kept on playing.直到比赛的最后一分钟我们还在继续比赛。Not until he finished his work did he go home.（倒装）直到他完成了工作，他才回家。till,until只用于时间。We walked till the edge of the forest.（要用as far as或to）。【错误】我们一直走到森林的边缘。till,untiltill,until作副词译“曾经”，作为连词译“一旦”，引导条件状语从句。相当于if的加强形式。I dont believe he was once

10、a thief.(once这里是副词)我不相信他曾经是小偷。Oncedestroyed,brain cellsdo notregenerate.(once连词)脑细胞一旦遭到破坏，就不能再生。once引导条件状语从句等于if not。Hell accept the job unless the salary is too low.除非薪水太低，否则他会接受这份工作的。(=Hell accept the job if the salary is not too low.)如果薪水不太低，他就会接受这份工作。unlessas引导时间状语从句，意为“当时”。As(he was)a young man

11、,he was a storekeeper and later a postmaster.他年轻时当过店主，后来当过邮政局长。He sang as he worked.as引导方式状语从句，意为“象一样”。We must do as the Party teaches us.百变天后asas引导原因状语从句。意为“由于”，As you are tired,you had better rest.既然你累了，你最好休息一下。as引导让步状语从句。意为“虽然”、“尽管”Child as he is,he can do it well.(=Although he is a child,he can

12、do it well.)虽然（尽管）他是个孩子，但他能做得很好。虽然（尽管）他是个孩子，但他能做得很好。as做为关系代词还可以引导定语从句。I have the same book as you do.我有一本和你一样的书。百变天后as牛刀小试牛刀小试 Nearly three years of high school had gone by_he finally realized the importance of studying hard.A.until B.while C.before D.so【答案】C【解析】考查状语从句的连词。他最终意识到努力学习的重要性之前,三年的高中生活几乎结束。三年的高中生活几乎结束了他才最终意识到学习的重要性。牛刀小试牛刀小试You will never gain success _you are fully devoted to your workA.when B.because C.after D.unless【答案】D【解析】本题考查状语从句的连词。这几个词中最重要的考点是 unless“除非否则,根据本题句意:除非你全力以赴投入到工作中,否则你不会收获成功。因此本题选D。相 似 连 词小结 相 似 连 词小结温示提馨本节结束，谢谢观看本节结束，谢谢观看!