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 subject

2. 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 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： what, 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，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 didn't go to see the film. It doesn't 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

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... 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 straight lines.

5. is interesting you should like him.（竟然）

6. Where we will go hasn't been decided.

7. she couldn't understand was the last question.

8. we will attend the lecture hasn't been decided. （句首只用 whether）

9. is still uncertain he is coming. （whether/ if）

【预习疑问】

【课堂探究】

主语从句

观察：⑴ That he is a student is a fact .

　　　　　What he said is true \ What he wants to buy are books

　　　　　Where he was born and how he was brought up aren't known to us .

⑵ 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 .

⑶.It is said that the earthquanke happened in Yunnan.

⑷ It is natural that the native can speak English fluently .

⑸ It is suggestive that she should go to college .

⑹ It is no wonder that he was lying .

It is the fact that he didn't pass the exam .

⑺ It seemed \appeared \happened that he had gone there.