1、Astronomy:the science of the stars 编号 003【学习目标】1. Through series of activities , the students will be able to 1. speak out the sentences using noun clauses as the subject2. use noun clauses as the subject correctly 【教学重点】Enable the students to grasp the usages of the sentences using noun clauses as
2、the the subject【教学难点】How to enable the students to grasp the usages of the sentences using noun clauses as the subject【知识链接】引导词： w hat, who, which, when , why , how, where, that , whether,【自主预习】 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语 it 代替，而本身放在句子末尾。 1. It 作形式主语和 it 引导强调句的比较 It 作形式主语代替主语从句，主要是为了平衡句子结构
3、，主语从句的连接词没有变化。而 it 引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词 that。被强调部分指人是 也可用 who/whom。例如： It is a pity that you didnt go to see the film. It doesnt interest me whether you succeed or not. It is in the morning that the murder took place. It is John that broke the window. 2. 用 it 作形式主语的结构 (1) It is 名词从句
4、It is a fact that 事实是 It is an honor that 非常荣幸 It is common knowledge that 是常识 It is a surprise that 令人惊奇的是(2) it is 形容词从句 It is natural that 很自然 It is strange that 奇怪的是 (3) it is 不及物动词从句 It seems that 似乎 It happened that 碰巧Itappears that似乎 It occurred to me that(4) it 过去分词从句 It is reported that 据报道
5、 It has been proved that 已证实 It is believed that人们相信It is known to all that 众所周知 It has been decided that 已决定【自学检测】1. we should do next is not clear.2. is said the weather will stay hot for another two days.3. light travels in straight lines is known to us all.4. is known to us all light travels in
6、straight lines.5. is interesting you should like him.（竟然）6. Where we will go hasnt been decided.7. she couldnt understand was the last question.8. we will attend the lecture hasnt been decided. （句首只用 whether）9. is still uncertain he is c oming. （whether/ if）【预习疑问】【课堂探究】主语从句观察： That he is a student i
7、s a fact . What he said is true What he wants to buy are books Where he was born and how he was brought up arent known to us . Whether he can go to school is being discussed . (此处不可用 if ?)Where When How Why the meeting was held is unclear . .It is said that the earthquanke happened in Yunnan. It is
8、natural that the native can spe ak English fluently . It is suggestive that she should go to college . It is no wonder that he was lying .It is the fact that he didnt pass the exam . It seemed appeared happened that he had gone there.用法小结 . 注意的几个 it 句式1.It is was the first time that S+ have ha d don
9、e . （ 这是第次.）2. It is high time that S+ should do did sth (到.时间)3. It is + 短时间 since S+ did . (这件事发生.久)4. It wont be long before S+ do (不久 )5. 强调句式： It was is .that who. (注意检测办法 ) Do Exercises 1. _ as much as one-fifth of all timber harvested is not used.A. The estimate B. The estimate C. They are es
10、timated D. It is estimated that2. _ some mammals came to live in the sea is not known.A. Which B. Since C. Although D. How 3. _ we have achiev ed is attributed to the guidance of our parents.A. Whoever B. What ever C. However D. That 4. _ wealthy does not necessarily mean that a man is greedy.A. For
11、 the reason that he is B. Just because he is C. The reason of being D. That he is 5. Although _ happene d in this developed country sounds like science fiction, it could occur elsewhere in the world.A. which B. what C. how D. it6. _ she had forgotten to take her notebook.A. That oc curred to her B.
12、She occurred that C. To her that occurred D. It occurred to her that7. I am sure that _ she said is wrong.A. which B. all C. this D. what8. We lost our way in the f orest, and _ made matters worse was that it was getting dark.A. that B. which C. it D. what9. _ some mammals came to live in the sea is
13、 not known.A. Which B. Since C. Although D. How 10. _ or not is still uncertain.A. Hes coming B. If he is coming C. That coming D. Whether hes coming11. Its _ hell be able to come.A. doubt whether B. doubtful C. doubt it D. doubtful whether 12. _ he is at work in the heart of the big city or at home
14、 in the quiet suburb, Dicks life is tied to machines.A. Whether B. Till C. If D. Unless13. _ he saw both surprised and frightened him.A. That B. When C. What D. Which14. _ is a spell of warm sunshine.A. What do we all need. B. What all we need C. What we need D. What we all need15. _ is a pity that
15、he should feel so upset. A. What B. That C. He D. It16. _ a spoonful of soil can tell us so much about the structure and early history of the moon.A. Remarkable B. Quite remarkably C. It is remarkable that D. It is remarkable fact that17. _ you nominate will be elected. A. Who B. Whom C. Whomever D. Thats 18. _ book you borrow must be returned within a week.A. What B. Which C. Whichever D. Thats 19. _ of us gets home first starts cooking.A. Who B. Which C. Whichever D. Anyone20. _orders he gives are obeyed.A. Whichever B. Which C. Whatever D. What 【总结反思】
