人教高中英语必修3 Unit4 Astronomy: the science of the stars 主语从句学案

Unit 4 Astronomy:the science of the stars(语法教学案)
【学习目标】
1. 复习名词性从句
2. 学习主语从句用法。
【重点难点】
1. 重点：主语从句及如何使用。
2. 难点：掌握主语从句连接词的用法，举一反三.
【学情分析】
掌握语法---主语从句的用法，能够举一反三。
【回忆旧识】
★主语从句的含义--你所了解的主语从句。
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Step One：?
一、概述：在句子中起名词作用的各种从句统称为名词性从句。根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。
二.主语从句主要有三类：
（1） 由连词that引导的主语从句:引导词that无含义,在句中不做成分,不可以省。
e.g.：That you will win the medal seems unlikely.
（2） 用连词 whether 引导的主语从句:whether有含义(是否),在句中不做成分,不可以省。
E. g：Whether she is coming or not doesn’t matter too much.
（3） 用连接代词引导的主语从句(在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分).
e.g：What you need is more practice.
（4）用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。
e..g:Where we should leave it is a problem.
3. 注意点:
1.it 做形式主语,而将主语从句放在句末（尤其是当谓语较短时）。
例如：That light travels in straight lines is known to all.
固定用法和译法
（1） It is +名词+从句
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 a mystery to me how it all happened.
（2） 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.
例如：It is obvious that conductors and insulators are both important in industry.
（3） 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,etc.
例如：It is thought that he is the best player.
碰巧我昨天看见他了。
当“及物动词 + 宾语”较短时，也可用这种结构。
例如：It shocked me that Peter did not tell anybody where he was.
2.只用whether不用if引导主语从句.
巩固练习
一、 填上适当的连接词
(1)._______ he will win is certain.
(2).It has been reported ______sales of beef in China will increase.
(3).________ we shall raise ducks or geese remains to be decided.
(4).__________ he ’ll join us in the discussion is of great importance.
(5)._________ bag it is can not be told.
(6).__________ India needs is a law to make land ownership fairer.
二、单句改错
1. Light travels faster than sound is common knowledge.
2. If she’s coming or not doesn’t matter much.
3. That the professor said is of great importance.
4.When and where the meeting will be held still remain a question.
三、单项选择
1．______ they are most interested in is how they can produce more and better cars.
A. That B. What C. Whatever D. Which
2．______ we’ll go camping tomorrow depends on the weather.
A. If B. Whether C. That D. Where
3. ________ makes mistakes，we must correct them.
A. What B. That C. Whoever D. Whatever
4. ______ surprised me most was that such a little boy of seven could play the violin so well.. A. That B. What C. Which D. When
5. ________ we go swimming every day ________ us a lot of good.
A. If…do B. That…do C. If…does D. That…does
6. ________ the boy didn't take medicine made his mother angry.
A. That B. What C. How D. Which
7 ____ we can't have seems better than what we have.
A. What B. Who C. That D. whose
8. ____ you don't like him is none of my business.
A. What B. Who C. That D. Whether
9. ____ we'll go camping tomorrow depends on the weather.
A. If . B. Whether C. That D. Where
10. _______is going to do the job will be decided by(由……决定） the CEO.
A. That B. Why C. How D. Who
11. _______ we'll finish translating the book depends on the time.
A. When B. Why C. What D. That
12. _______ team will win the match is none of my business.
A. Which B. That C. If D. How
13.(北京2006) ---Could you do me a favor? ---It depends on ___ it is.
A. which B. whichever C. what D. whatever
答案：
一、 填上适当的连接词
1. That 2. That 3.Whether 4.That 5.Whose 6. What
二、单句改错
1. 句首加That 2. If 改为Whether 3.That 改成What 4. remain 改成remains

三、单项选择：BBCBD AACBD AAC