豌豆语法17主语从句讲解1ppt课件

1、Subject Clauses主语从句主语从句豌豆语法豌豆语法-主语从句主语从句豌豆群：豌豆群：7298916定义：定义： 用作主语的从句叫主语从句，它是名词用作主语的从句叫主语从句，它是名词 性从句之一。性从句之一。引导主语从句的衔接词有：引导主语从句的衔接词有： 从属连词从属连词: that, whether； 衔接代词衔接代词: who (whoever), whom, whose, what (whatever)和和which (whichever)； 衔接副词衔接副词: when, where, how和和why。1.衔接词：衔接词：1从属连词：从属连词：that， whether

2、引导主语从句只起引引导主语从句只起引导作用，在主语从句中不充任任何成分，导作用，在主语从句中不充任任何成分，that本身本身无实践意义，但不能省略无实践意义，但不能省略. whether意为意为“能否，能否，放在句首句末皆可。放在句首句末皆可。 Thatpricewillgoupiscertain.Thathewillcomeiscertain.Whetherwegobytrainorbyboatmakesnodifference.Whetherhellcomehereisntclear.2)衔接代词衔接代词 who ( whoever) , what (whatever ), which (

3、whichever), whom, whose .Whichsidewillwinisnotclear.Whowillwritethepoemhasnotbeendecidedyet.Whateverhedidisright.Whokilledthescientistremainsaquestion.Whomsheborrowedmoneyfromstillpuzzledhim.3)衔接副词衔接副词when，where， how， why等。等。Howthishappenedisnotcleartoanyone.Whenhewillbebackdependsontheweather.Whenw

4、ellstarttomorrowwillbetoldsoon.Wherethetestwillbegivenisnotyetdecided.主语从句后置主语从句后置! 为了防止主语冗长为了防止主语冗长,句子头重脚轻句子头重脚轻,经经常用常用 it 作作 方式主语方式主语,主语从句放主语从句放在后面作真正的主语在后面作真正的主语. 例例: That we shall be late is certain. - Its certain that we shall be late. 1. That the earth is round is known to all. - 2. That you m

5、issed the chance is a pity. - It is a pity that you missed the chance.Its known to all that the earth is round.A.Itis+描画词描画词+从句从句Itisnecessarythat有必要有必要Itisclearthat很清楚很清楚Itislikelythat很能够很能够Itisimportantthat重要的是重要的是类似的描画词还有：类似的描画词还有：strange;natural;obvious;true;good;wonderful;possible;unlikely;quit

6、e;unusual;certain;evident;worth-while;surprising;interesting;astonishing,etc.例如：It is obvious that conductors and insulators are both important in industry.It is doubtful whether she will be able to come.她能否能来令人疑心。It was really astonishing that he refused to talk to you .他回绝和他说话真是令人诧异。It is essentia

7、l that he should be here by the weekend .周末之前，他应该到这里是必要的。It seems obvious that we can not go on like this.很明显我们不能这样下去了。 (4) It doesnt matter how/whether 构造中的主语从句不可提早。例如： It doesnt matter whether he is wrong or not. (5) 含主语从句的复合句是疑问句时，主语从句不可提早。例如： Is it likely that it will rain in the evening? 4. Wha

8、t 与that 在引导主语从句时的区别 What 引导主语从句时在从句中充任句子成分，如主语宾语表语，而that 那么不然。例如： What you said yesterday is right. 1主语从句在句首时，必需由衔接词引导，不能省略这些主语从句在句首时，必需由衔接词引导，不能省略这些衔接词。衔接词。误：误：They should like each other is natural.2)假设主语从句放在句首，不能用假设主语从句放在句首，不能用if引导，但是假设用引导，但是假设用it 做做方式主语，而把主语从句放在句末时，也可以用方式主语，而把主语从句放在句末时，也可以用if引导引

9、导.误：误：If Mary really heard him is really doubtful.注注 意意正：正： That they should like each other is natural. It is natural that they should like each other.正：正：Whether Mary really heard him is really doubtful. It was doubtful if Mary really heard him. Whatyouleftareonlyseveraloldbooks. Whatyousaidisofgr

10、eatimportance.3主语从句中用陈说语序主语从句中用陈说语序,后面的谓语动词用第三人称单数后面的谓语动词用第三人称单数4“what引导主语从句时，谓语动词：引导主语从句时，谓语动词： 常与其后的名词作表语一致常与其后的名词作表语一致 ，且根据句子的语境，且根据句子的语境而定。而定。 eg：5) . 用于用于 It is important / natural / necessary / impossible that.句型中句型中, 主语从句应运用虚拟语气主语从句应运用虚拟语气, 用用“should + 动词原形的方式动词原形的方式, should有时可以省略。有时可以省略。6) .

11、 在在 It + be + suggested/advised/ordered/requested/ insisted/required 中中, that从句的谓语也应该用从句的谓语也应该用“should + 动词原形的方式动词原形的方式, should有时可以省略。有时可以省略。 _ he made an important speech at the meeting was true. A. That B. Why C. What D. How 2. _well go camping tomorrow depends on the weather . A If B Whether C Th

12、at D Where 3._ is known to us all that America is a developed country . A Which B As C What D It 4. Its known to us all _ a form of energy . A. water is B. that water is C. is water D. that water to 5. It worried her a bit _ her hair was turning gray. A. whether B. that C. what D. when6.What I say a

13、nd think _ none of your business. A. is B. are C. has D have7. _ Tom liked to eat was different from _.A. Thatthat you had expected B. What that you had expectedC. Thatwhat you had expected D. Whatwhat you had expected8 (09天津天津7) It is obvious to the students _ they should get well prepared for their future.as B. which C. whether D. that9.(07陕西陕西8)parents say and do has a life-long effect on their children.A . ThatB . WhichC . WhatD.As10.(07福建福建35)It is none of your businessother