豌豆語法17主語從句講解1ppt課件

1、Subject Clauses主語從句主語從句豌豆語法豌豆語法-主語從句主語從句豌豆群：豌豆群：7298916定義：定義： 用作主語的從句叫主語從句，它是名詞用作主語的從句叫主語從句，它是名詞 性從句之一。性從句之一。引導(dǎo)主語從句的銜接詞有：引導(dǎo)主語從句的銜接詞有： 從屬連詞從屬連詞: that, whether； 銜接代詞銜接代詞: who (whoever), whom, whose, what (whatever)和和which (whichever)； 銜接副詞銜接副詞: when, where, how和和why。1.銜接詞：銜接詞：1從屬連詞：從屬連詞：that， whether

2、引導(dǎo)主語從句只起引引導(dǎo)主語從句只起引導(dǎo)作用，在主語從句中不充任任何成分，導(dǎo)作用，在主語從句中不充任任何成分，that本身本身無實(shí)踐意義，但不能省略無實(shí)踐意義，但不能省略. whether意為意為“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)銜接代詞銜接代詞 who ( whoever) , what (whatever ), which (

3、whichever), whom, whose .Whichsidewillwinisnotclear.Whowillwritethepoemhasnotbeendecidedyet.Whateverhedidisright.Whokilledthescientistremainsaquestion.Whomsheborrowedmoneyfromstillpuzzledhim.3)銜接副詞銜接副詞when，where， how， why等。等。Howthishappenedisnotcleartoanyone.Whenhewillbebackdependsontheweather.Whenw

4、ellstarttomorrowwillbetoldsoon.Wherethetestwillbegivenisnotyetdecided.主語從句后置主語從句后置! 為了防止主語冗長為了防止主語冗長,句子頭重腳輕句子頭重腳輕,經(jīng)經(jīng)常用常用 it 作作 方式主語方式主語,主語從句放主語從句放在后面作真正的主語在后面作真正的主語. 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+描畫詞描畫詞+從句從句Itisnecessarythat有必要有必要Itisclearthat很清楚很清楚Itislikelythat很能夠很能夠Itisimportantthat重要的是重要的是類似的描畫詞還有：類似的描畫詞還有：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.她能否能來令人疑心。It was really astonishing that he refused to talk to you .他回絕和他說話真是令人詫異。It is essentia

7、l that he should be here by the weekend .周末之前，他應(yīng)該到這里是必要的。It seems obvious that we can not go on like this.很明顯我們不能這樣下去了。 (4) It doesnt matter how/whether 構(gòu)造中的主語從句不可提早。例如： It doesnt matter whether he is wrong or not. (5) 含主語從句的復(fù)合句是疑問句時，主語從句不可提早。例如： Is it likely that it will rain in the evening? 4. Wha

8、t 與that 在引導(dǎo)主語從句時的區(qū)別 What 引導(dǎo)主語從句時在從句中充任句子成分，如主語賓語表語，而that 那么不然。例如： What you said yesterday is right. 1主語從句在句首時，必需由銜接詞引導(dǎo)，不能省略這些主語從句在句首時，必需由銜接詞引導(dǎo)，不能省略這些銜接詞。銜接詞。誤：誤：They should like each other is natural.2)假設(shè)主語從句放在句首，不能用假設(shè)主語從句放在句首，不能用if引導(dǎo)，但是假設(shè)用引導(dǎo)，但是假設(shè)用it 做做方式主語，而把主語從句放在句末時，也可以用方式主語，而把主語從句放在句末時，也可以用if引導(dǎo)引

9、導(dǎo).誤：誤：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主語從句中用陳說語序主語從句中用陳說語序,后面的謂語動詞用第三人稱單數(shù)后面的謂語動詞用第三人稱單數(shù)4“what引導(dǎo)主語從句時，謂語動詞：引導(dǎo)主語從句時，謂語動詞： 常與其后的名詞作表語一致常與其后的名詞作表語一致 ，且根據(jù)句子的語境，且根據(jù)句子的語境而定。而定。 eg：5) . 用于用于 It is important / natural / necessary / impossible that.句型中句型中, 主語從句應(yīng)運(yùn)用虛擬語氣主語從句應(yīng)運(yùn)用虛擬語氣, 用用“should + 動詞原形的方式動詞原形的方式, should有時可以省略。有時可以省略。6) .

11、 在在 It + be + suggested/advised/ordered/requested/ insisted/required 中中, that從句的謂語也應(yīng)該用從句的謂語也應(yīng)該用“should + 動詞原形的方式動詞原形的方式, should有時可以省略。有時可以省略。 _ 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陜西陜西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