主语从句讲解 （ppt课件）-2025届高三英语上学期一轮复习专项.pptx

1、主语从句主语从句Who will win the match is still unknown.谁会赢得这场比赛，目前还不清楚。在复合句中，作主语的句子称为主语从句，通常位于谓语动词之前连接词连接词从属连词：that、whether、if关系代词：who,what,which,whom,whose,whatever,whoever,whomever,whichever关系副词：when,where,how,why,however,whenever,wherever从属连词Whether she will come or not is still a question.她是否会来仍是一个问题。她

2、是否会来仍是一个问题。That they will go is certain.他们去是肯定的。他们去是肯定的。1.从属连词that，whether引导的主语从句：引导主语从句，它们在从句中不担任成分，不能省略注意：whether，if的区别：（1）whether 引导主语从句可以放句首，也可以放句尾，表示引导主语从句可以放句首，也可以放句尾，表示“是否是否”，不可省略。不可省略。（2）If引导的主语从句只能放在句尾，前面要用引导的主语从句只能放在句尾，前面要用 it 作形式主语。作形式主语。Whether she will come or not is uncertain.她会不会来还不确定

3、。It remains to be seen if they can be good parents.他们是否能成为一对合格的父母还有待观察。随堂练习：用whether,if或that填空1._the meeting will be put off hasnt been decided yet.2.It remains unknown_we will go for an outing tomorrow.3._the earth is round is true.4._ you missed such an interesting film is a pity.5._ shes coming o

4、r not doesnt matter too much.Whetherwhether/ifThatThatWhether关系代词由关系代词引导的主语从句：由关系代词引导的主语从句：who,what,which,whom,whose,whatever,whoever,whomever,whichever等，引导主语从句时，它们分别在从句中担等，引导主语从句时，它们分别在从句中担任任主语、宾语或定语主语、宾语或定语，不能省略不能省略。Whoever leaves the room last ought to turn off the lights.无论谁最后离开房间，都应该关灯无论谁最后离开房间

5、，都应该关灯注意：no matter who和whoever的区别：1.no matter who通常只能引导状语从句，而不能引导名词性从句。2.whoever 既可引导名词性从句也可引导状语从句关系副词Why he didnt come here is not clear to anyone.他为什么没来谁也不清楚。他为什么没来谁也不清楚。How a telephone works is a question which not everyone can answer.电话是怎样工作的，这个问题并不是每个人都能回答。电话是怎样工作的，这个问题并不是每个人都能回答。Where she has

6、gone is not known yet.她去了哪儿，还不知道。她去了哪儿，还不知道。When they will start has not been decided yet.他们何时动身还未定下来。他们何时动身还未定下来。关系副词引导的主语从句：when,where,why,how,however,whenever,wherever等引导主语从句时，它们在从句中担任状语，不能省略。随堂练习1._you dont like him is none of my business.A.What B.Who C.That D.Whether2._ well go camping tomorrow

7、 depends on the weather.A.If B.Whether C.That D.Where3._ is going to do the job will be decided by the manager.A.That B.Why C.How D.Who4._well finish translating the book depends on the time.A.When B.Why C.What D.That5._he wont go there is clear to all of us.A.How B.What C.Why D.ThisIt+be+形容词（clear/

8、unfair等）+that.Itsstrangethathedidntcomeyesterday.It+be+名词词组（afact/apity/ashame等）+that.Itisaquestionthatwhowillholdthemeeting.It+be+过去分词（announced/believed/expected等）+that.Itissaidthattherewasaterribleplanecrashthismorning.It+seems/appears/happens等+that.Itseemsthatheisagoodguy.有时为了避免头重脚轻，常用it作形式主语，真正

9、的主语放后面。注意：在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should)+do”Itisapitythatyou(should)havetoleave.随堂练习：翻译句子1.吸烟危害健康，这是事实。2.中国人口众多是一件极大的好事。3.据说Jack篮球打得很棒。4.对她来参加聚会来说很重要。5.他们似乎已经离开了北京。Itisafactthatsmokingisadangertohealth.ItisagoodthingthatChinahasabigpopulation.ItssaidthatJackplaysbasketballverywell.

10、Itisimportantforhertocometotheparty.ItseemsthattheyhavealreadyleftBeijing.（4）Itdoesntmatterhow,whetherornot结构中的主语从句不可提前。Itdoesntmatterwhetherhelikesitornot.他喜欢与否无关紧要。主语从句不可位于句首的四种情况。（1）含主语从句的复合句是疑问句、感叹句时，主语从句不可提前，用引导词it作形式主语。Isitreallytruethathehasgoneabroad?他真的出国了吗？Howsurprisingitwasthathefailedint

11、heexam!真令人惊奇，他考试没有及格！（2）Itissaid,reported,结构中的主语从句不可提前。Itssaidthattheplayisveryinteresting.据说戏剧很有趣。Itsreportedthatthehighwaywillbeopenedtotrafficnextweek.据报道，高速路下周通车。（3）Ithappens,occurs结构中的主语从句不可提前。Itoccurredtoherthatshehadforgottentolockthedoor.她突然想起忘了锁门。IthappenedthatImethiminthestreet.我恰巧在大街上遇到了他

12、。强调句：去掉强调句：去掉it is.that部分，句子意思仍然完整部分，句子意思仍然完整It is certain thatthat shewillsucceed.她会成功是肯定的。（主语从句）It is in New York that I met him.是在纽约我见到了他。（强调句）it作形式主语与it引导强调句的比较随堂练习：用适当的连接词填空1.It is probable_it will rain today.2._ you dont like him is none of my business.3._ matters most in learning English is e

13、nough practice.4._ breaks the law can never escape from being punished.5._ of them will take charge of our company is still being discussed.thatThatWhatWhoeverWhich随堂练习：用适当的连接词填空6._ worries us most is that the number of the kids dominated by computers is growing fast.7._one can turn his dream into a

14、 reality depends on his talent and the efforts he makes.8._I believe is that you need to act smartly,instead of following what everyone else is doing.9.It is required in the regulations_you shouldnt tell other people the password of your e-mail account.10.It has been proved_ eating vegetables in childhood helps to protect you against serious illnesses in later life.WhatWhetherWhatthatthatThanks