人教版高中英语必修三 Unit 4 Astronomy: the science of the stars Learning about Language课件 (共26张PPT)

课件26张PPT。Unit 4 Astronomy：the science of the stars
Learning about Language1. Learn something about Noun Clauses as the subject.
2. Learn how to use Noun Clauses as the subject.
3. Master the grammar through practice.Learning aimsWhat part does the underlined part serve as in each sentence?
A tree has fallen across the road.
You are a student.
To find your way can be a problem.
Smoking is bad for you.Leading-in “How do you do” is a greeting.
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.1. 主语从句：从句在句中充当主语成分1) That he will succeed is certain.
2) Whether he will go there is not known.
3) How we can help the twins will be discussed at the meeting. 注意语序的变化Subject Clause
主语从句2. 引导主语从句的连接词有三类：
(1)??连词that, whether
Whether we go by train or by boat makes no difference.
Whether?he’ll?come?here?isn’t?clear.??
That prices will go up is certain.What?she?did?is?not?known yet.
Who will write the poem has not been decided yet.
Whatever he did is right.(2)?连接代词who,?whom,?whose,?what,?which,?whoever,?
whatever,?whichever等。(3) 连接副词?where,?when,?how,?why等。
How?this?happened?is?not?clear?to?anyone.?When he will be back depends on the weather.
How the pyramids were built is still a mystery.注意时态3. 主语从句后置
为了避免主语冗长,句子头重脚轻,经常用it作形式
主语, 主语从句放在后面作真正的主语。
1. That we shall be late is certain.
—
2. That the earth is round is known to all.
—
3. That you missed the chance is a pity.
—It is a pity that you missed the chance.It’s known to all that the earth is round.It’s certain that we shall be late.A.??It + be+形容词(obvious,?true,?natural,?surprising,?good,?wonderful,?
funny,?possible,?likely,?certain,?probable,?etc.) +that从句。It?is?certain?that?she?will?do?well?in?her?exam.?
B.??It+be+名词词组(no?wonder,?an?honour,?a?good?thing,?a?pity,?
no?surprise,?etc.) +that从句。It’s?a?pity?that?we?can’t?go.??4. 用it 作形式主语的结构C.??It+ be+过去分词(said,?reported,?thought,?expected,?decided,?announced,?arranged,?etc.) + that从句。
It?is?said?that?Mr?Green?has?arrived?in?Beijing.?D.??It+ seems,?happens等不及物动词及短语+that从句。It?happened?that?I?was?out?that?day.?
E.?It+ doesn’t?matter?(makes?no?difference,?etc.)+连接代词或连接副词引导的主语从句。
It?doesn’t?matter?whether?she?will?come?or?not.?What you left are only several old books.
What you said is of great importance.
Whether?he’ll?come?here?is not?clear.?1. “if” 不能引导位于句首的主语从句，应用“whether”引导。3.主语从句的 “that” 一般不能省略。4.“what”引导主语从句时，谓语动词
1) 常与其后作表语的名词一致
2) 根据句子的语境而定5. 主语从句需注意的问题2.主语从句中用陈述语序。作表语6. 常见错误展示
下列各句均有一处错误，请改正并分析错误的原因。
1. Light travels faster than sound is common knowledge.
2. If she’s coming or not doesn’t matter much.
Thatthat虽无词义但引导主语从句位于句首时不能省略。if, whether都可表示“是否”, 但if不能引导位于句首的主语从句，它可以引导后置的主语从句。Whether3. That the professor said is of great importance.
4. Where will the trees be planted has not been decided.

that引导主语从句时无词义。
What the professor said 表示“教授所说的”。将will置于trees之后。主语从句要用陈述语序。What
5. No matter who breaks the rule will be punished.
6. When and where the meeting will be held still remain
a question.引导让步状语从句时二者可互换，但引导名词性从句时只能用whoever。主语从句表示单一概念时，谓语要用单数形式。Whoeverremains
7. What were your problems a year ago has now become mine.
8. It was requested that everyone made a speech at the meeting.has要改为have。主语从句表示复数概念时，谓语要用复数形式。在“It is requested / ordered / suggested + that从句”中，从句要用虚拟语气，即谓语用“should + 动词原形”，should可省略。have(should) make 【高考链接】完成句子。1. (2017·北京高考) Every year, _________ makes the
most beautiful kite will win a prize in the Kite
Festival.
每年制作出最漂亮风筝的人都会在风筝节上获奖。whoever 2. (2016·北京高考) Your support is important to our work. __________ you can do helps.
你们的支持对我们的工作很重要,无论你们做什么都会有所帮助。Whatever3. (2015?北京高考) _____ we understand things has a lot to do with what we feel.
我们如何理解事情与我们的感受有很大关系。How4. (2015?江苏高考) _______ Li Bai, a great Chinese
poet, was born is known to the public, but some won’t accept it. 中国伟大诗人李白的出生地大家都知道，但是一些人不接受。Where5. (2013?天津高考) _______ I want to tell you is the deep love and respect I have for my parents.
我想告诉你的是我对父母深深的爱和敬意。WhatⅠ. 用适当的连接词填空，使下列主语从句意思完整。
1. _______ he finished writing the composition in such
a short time surprised us all.
2. _______________ we will go for an outing
tomorrow remains unknown.
3. It is a pity ______ we won’t be able to go to the
south to spend our summer holidays.ThatWhether / WherethatClass exercises4. _______ she is coming or not doesn’t matter too much.
5. _______ he came from still puzzles all of us.
6. It happened _____ I saw him yesterday.
7. It does not make any difference to me ______ you do. WhetherWherethatwhat8. _____ was responsible for the accident is not yet clear.
9. ____________________ they will have the sports meet
is still a question.
10. It doesn’t matter ______ she looks like.WhoWhen/Where/Whetherwhat What he made an important speech at the meeting
was true.2. That is known to us all is that America is a developed
country belonging to the First World.
3. It's known to us all what water is a form of energy.
——ThatⅡ. 单句改错——What——that4. It worried her a bit what her hair was turning gray.
5. What I say and think are none of your business.
6. That they can solve the question is still unknown.
——that——is——WhetherHomework
1. Finish exercise on P28 .
2. Finish the exercises on the paper.
3. Preview “ A visit to the moon” on P30.Light come, light go.
来得容易，去得快。