高三英语一轮Grammar 主语从句 (共20张PPT).ppt

1、Subject Clauses主语从句What she said is not yet known.That we shall be late is certain.It is certain that we shall be late.We can see from these sentences that a sentence serves as subject,so we call it Subject Clause.主语从句（Noun Clauses as the Subject）定义：用作主语的从句叫主语从句，它是名词性从句之一。引导主语从句的连接词有：连词that,whether；

2、连接代词who,whom,whose,what和which；连接副词when,where,how和why。用法：1)what在主语从句中作主语，表语，宾语，定语What the teacher said today was quite right.老师今天说的话是十分正确的。What made him sad was that his father died yesterday.What China used to be no longer exists today.2)由连词that引起的主语从句：That they are badly in need of help is quite cl

3、ear.他们急需帮助，这是十分明显的。但是这类句子在大多数情况下会放到整个句子的后部去，而用代词it作形式主语。处理好几对关系1.that 和what1._ I cant understand is why he has changed his mind.2._ the earth is round is known to us all.先找句子主干Sth is why he.Sth is unknownWhatThat连词_在从句中不作成分，不含有疑问意义，而_在从句中作成分如主语、宾语、表语，定语，常含有疑问意义。thatwhat请你归纳：3)由连接代词或连接副词以及whether引起的主

4、语从句。Whether they will sell the house is not yet decided.他们是否卖掉这所房子还没有决定。That we have got the first in the Olympics is a fact.whether we will win the competition is uncertain.请你归纳that/whether无有。表“是否”表不确定性无无Notice:引导主语从句表“是否”不能用if只能用whetherI dont know _ we will win the competition.if/whetherI know(tha

5、t)we have got the first in the competition.Notice:引导主语从句的that尽管无词义无成分但不可省 4)whatever,whoever也可引导主语从句。Whatever was said here must be kept secret.这里说的话都应当保密。Whoever makes mistakes must correct them.凡犯了错误的人都必须改正。Who/whoever,what/whatever1._ was said here must be kept secret.2._we need is more time.3._m

6、ade the long distance call to him is not important.4._ breaks the law will be punished.WhateverWhatWho Whoever_引导的主语从句不含疑问意义，相当于名词后加一个定语从句；而_引导的主语从句都含有疑问意义。whatever和whoeverwhat和whoAnything that was saidAnyone that breaks the law疑问词+ever/no matter+疑问词Eg:1.Whoever breaks the competition rule should be

7、 punished.2.Whoever/No matter who breaks the competition rule,he should be punished_等同类词既可以引导名词性从句，也可以引导让步状语从句，而 _只能引导让步状语从句。whoeverNo matter who 注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免“头重脚轻”,常用 it 作形式主语,而把从句放在后面。例如:It is a pity that she has made such a mistake.她犯了这样一个错误,真是遗憾。这样就构成了下面一些常用句型:1)It is+adj.

8、/n.+从句It is a pity/shame that.遗憾的是It is possible that.很可能It is unlikely that.不可能2)It+vi/link.verb+从句It seems/appears that.似乎It happened that.碰巧 3)It+be+过去分词+从句It is said that.据说 It is known to all that.众所周知 It is reported that.据报道It is believed that.据信;人们相信 It is suggested that.有人建议It must be pointe

9、d out that.必须指出 It has been proved that.已证明.如:It is believed that at least a score of buildings were damaged or destroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉。5).用于It is important/natural/necessary/impossible that.句型中,主语从句应使用虚拟语气,谓语动词用“should+动词原形”的形式,should有时有感情色彩。1._ you dont like him is none of my business.2._ h

10、e said at the meeting astonished everybody present.3._ the 2000 Olympic Games will be held in Beijing is not known yet.4._ well go camping tomorrow depends on the weather.5._ leaves the room last ought to turn off the lights.ThatWhatWhetherWhetherWhoeverFill in the blanks 6._ is a fact that English

11、is being accepted as an international language.7.It worried her a bit _ her hair was turning grey.8.The Foreign Minister said,“_ is our hope that the two sides will work towards peace.”9.After Yang Liwei succeeded in circling the earth,_ our astronauts desire to do is to walk in space.ItthatItwhat1.

12、他在找什么与你无关。用主语从句翻译下列句子。2.他喜欢这种书，这件事非常有趣。3.他是否能来仍然是个问题。What he is looking for is none of your business.That he likes books of this kind is very interesting.It remains a question whether he will be able to come.5.飞机何时起飞还没有宣布。4.他们哪一个是从监狱里逃跑的，仍然是个谜。Which of them escaped from the prison is still a mystery.When the plane is to take off has not been announced./It has not been announced when the plane is to take off.