2023届高考英语复习主语从句课件 (33张ppt)

(共33张PPT)
主语从句
Dacy老师
定义
主语从句就是作主语的从句
它的连接词有连词、连接副词、连词代词
例子
比如：
That she came to my birthday party made me happy.
她来参加我的生日晚会了，这让我很高兴。
Where the English evening will be held has not been announced.
英语晚会将在哪里举行，还没有宣布。
用法
主语从句放在句首时，句子显得很笨重，因此常用it作形式主语，而将真正的主语后置，比如：
It is a pity that you have missed such a wonderful concert.
真遗憾你错过了这么精彩的一场音乐会。
温馨提示：在对符合句进行句型分析的时候，遇到从句的，先把从句当作一个句子成分先划出来，再对从句本身进行句型分析。
it 作形式主语
有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。
这分四种情况：
(1) 对于以连词that引导的主语从句，通常用形式主语it替代主语从句。
(2) 对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句。
(3) 对关系代词型what引导的主语从句，通常直接将主语从句放在句首。
(4) 如果句子是疑问句，则必须用带形式主语it的结构。
用法
连词that引导的主语从句，通常用形式主语it替代主语从句：It is +名词+从句。
句型：
It is a fact that… 事实是……；
It is good news that … 是好消息；
It is a question that … 是个问题；
It is common knowledge that … 是常识
类似的名词还有：a pity；a wonder；a good thing； no wonder； surprise等
例如：it is no surprise 毫不惊奇地
例子
It is a mystery to me how it all happened.
这是怎么发生的，对我来说就是一个谜。
It is common knowledge that the whale is not a fish.鲸鱼不是鱼，这是一个常识。
It is no surprise that China is making progress on such fronts: the manufacture of large passenger aircraft and high-speed trains, research in yeast and aerospace.
中国在很多尖端领域，如大飞机制造，高铁、干细胞、航天航空研究等领域取得飞速发展一点都不惊讶。
it is +形容词+从句
It is necessary that …有必要……；
It is clear that … 很清楚……；
It is likely that … 很可能……；
It is important that … 重要的是……
类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.
例子
It is doubtful whether she will be able to come.
我们很怀疑她是否能来。
It is essential that he should be here by the weekend.
周末他务必要来这里。
It seems obvious that we can not go on like this.很明显，我们不能再这样继续下去。
It is necessary that you （should）master the computer.
你必须要掌握电脑技术。
it is +过去分词+从句
It is said that … 据说……；
It is reported that … 据报道……；
It has been proved that … 已证明……；
It must be proved that… 必须指出……
类似的过去分词还有：
known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,等
例子
It used to be said that women must do twice as well as men to be thought half as good.
过去人们说女性必须做两倍于男性的工作才能获得一半于男性的好评。
It has not been made clear when the new road is to be opened to traffic.
目前还不清楚，该路段何时可通行使用。
其他
It seems（happened / appears / doesn’t matter / makes no difference / occurred …）that …主语从句不可提前
例子
It makes no difference whether he will attend the meeting or not.
他是否出席会议并没有什么不同。
For now, it appears that the dream might have to wait for his great-grandchildren.
从现在看来，这一梦想只有等他的重孙辈去实现了。
用连接代词引导的主语从句
对于以连接代词(副词)引导的主语从句，
可以使用形式主语代主语从句，
也可直接在句首使用主语从句：
例子
Whether they would support us was a problem.
他们是否会支持我们还是一个问题。
It was a problem whether they would support us.
他们是否会支持我们还是一个问题。
关系代词型what引导的主语从句
对关系代词型what引导的主语从句，通常直接将主语从句放在句首。
例子：
What we need is money.我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
有时也可用形式主语如：
It is clear enough what he meant.
他是什么意思很清楚。
如果句子是疑问句
则必须用带形式主语it的结构：
Is it true that he is the girl’s father
他是那女孩的父亲，是真的吗？
How is it that you are late again
你怎么又迟到了？
连词that的省略问题
引导主语从句的连词that有时可省有时不能省，
其原则是：若that引导的主语从句直接位于句首，
则that不能省略；
若that引导的主语从句位于句末，
而在句首使用了形式主语it，
则that可以省略：
例子
That you didn’t go to the talk was a pity.
很遗憾你没去听报告。(that不可省)
It was a pity (that) you didn’t go to the talk.
很遗憾你没去听报告。(that可省)
总结
本节难度指数：★★☆
一，主语从句可以由以下引导词引导：that /whether /whoever/which/whta /whatever /where / how/when/why /if
(1) That 引导主语从句，在主语从句中不做成分
That everyone may receive at least a moderate education is significant.
That education plays a vital role in all walks of life is clear
That advertisements are predominant in our day-to-day lives is obvious
总结
(2)Whether 引导主语从句，在主语从句中做状语。
Whether you can succeed in making your dream come true depends on hard work more than lick.
Whether technology is a blessing or a curse is discussed heatedly by people
Whether computers can replace the role of teachers has long been a hot topic
总结
(3)Whoever 引导主语从句，在主语从句中做主语。
Whoever wants to reach a distant goal must take many small steps
Whoever dares wins .
Whoever seeks obtains.
Whoever suffers gets.
总结
(4)Which 引导主语从句，在主语从句中做定语
Which way you turn is up to you
Which book you read is your decision
(5)What 引导主语从句，在主语从句中做主语，宾语。
What's done can't be undone .
What we do willingly is easy.
总结
(6) Whatever 引导主语从句，在主语从句中做主语，宾语
Whatever is at the center of our life will be the source of our wisdom and power.
Wherever you love and trust in this world loves you in return.
(7)Where 引导主语从句，在主语从句中做状语。
Where we love is home
总结
(8)How 引导主语从句，在主语从句中做状语。
How you think and act will influence your life .
(9) when引导主语从句，在主语从句中做状语。
When the sun is dining is the best time to repair the roof .
When you can make it depends on your efforts.
总结
(10)Why 引导主语从句，在主语从句中做状语。
Why so many people prefer to live in the city beyond me .
Why dinosaurs became extinct has long been a mystery to sxientists and researchers.
二，主语从句与形式主语it 的关系。
主语从句如果过长时，可用it替代，将原来的主语从句放在后面。
总结
三，雅思写作中形式主语从句的使用
1.It's a fact ......
2.It's strange.....
3It's no wonder.....
4It seems.......
5It's said......
6It's reported....
7.It's believed....
8.It's universally-accepted...
9.It's announced .....
10.It's estimated....
总结
11.It must be admitted.....
12.It's obvious ......
13.It can safely be said .......
14.It makes no difference.....
15.It's generally recognized........
16.It must be stressed out........
17.It has been proved..........
18.It is widely-accepted........
19.It can't be denied ...........
总结
20.It's as clear as crystal.......
21.It goes without saying.......
22.It is thought........
23.It is commonly found......
24.It should be noted that.....
25.It is acknowledged......
26.It is well-know....
27.It is known to all.....
28.It is always the case.....
29.It is crystal-clear....
练习
典型高考英语陷阱题详解 it的用法
1. Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
A. it, it B. what, what
C. it, what D. what, it
【陷阱】很容易误选B，认为两空均考查形式主语。
【分析】最佳答案是C，第一空填形式主语，真正的主语是其后的不定式 to play with fire。第二空填 what，what is difficult 是主语从句，注意 what is difficult 后的谓语动词 is。请做以下类似试题：
总结
(1) I know ______ is important to know my own limitations, but _______ is difficult is to help others to know their own limitations.
A. it, it B. what, what
C. it, what D. what, it
(2) Yes, ______ is difficult to find a job nowadays, but _____ is more difficult is try to find such a job with a high salary but little things to do.
A. it, it B. what, what
C. it, what D. what, it
总结
2. I dislike _______ when others laugh at me in public or think poorly of me behind.
A. that B. those
C. it D. them
【陷阱】几个干扰项均有可能误选。
【分析】最佳答案是C，因为在通常情况下，like 是及物动词，其后应有宾语(句中 it 即为其宾语)。句中的 when 从句不是宾语从句，而是时间状语从句，其中的 when 的意思是“当……的时候”。其实，也有的词典将 I don't like it when (if) … 作为一个句型来处理。能这样用的动词不多，主要的有enjoy, like, dislike, love, hate, prefer, appreciate等表示喜好的动词。
She won't like it if you arrive late. 她不喜欢你迟到。
He hates it when people use his bike. 他讨厌别人用他的自行车。
thank you
Dacy老师