名词性从句 （教案）
在句子中起名词作用的各种从句，通称为名词性从句。根据它们在句子中所起的作用，可分为主语从句、宾语从句、表语从句和同位语从句。
关于what 所引导的名词从句
what 引导名词性从句时，可表示两种意义：一是疑问意义，即“什么”；二是表示“„的东西”、“„事情”，相当于the thing which.Do you know what that is ? This is what he has asked for.
主语从句
主语从句可以直接放在主语的位置上；也可以用it 作形式主语，而将从句放在句末。That 引导的主语从句用it 作形式主语的尤为多见。 1) That light travels in straight lines is known to all.It is known to all that light travels in straight lines.2) When the plane is to take off has not been announced.It has not been announced when the plane is to take off.
用it 作形式主语从句结构
it 引导的主语从句已经形成下面的四种固定用法： 1）It is ＋名词＋从句 It is a fact that „ 2）It is ＋形容词＋从句 It is neceary that.„ 3）It is ＋过去分词＋从句 It is said „
4）It ＋不及物动词＋从句 It seems that „
注意：不要将强调句里的强调词it 和形式主语it 混淆起来。 强调句是it is (was)＋强调部分＋ that (who)„ 。 John bought a toy plane for his son yesterday.It was John that (who) bought a toy plane for his son yesterday.（强调主语）
It was a toy plane that John bought for his son yesterday.（强调宾语）
It was for his son that John bought a toy plane yesterday.（强调目的状语）
It was yesterday that John bought a toy plane for his son.（强调时间状语）
宾语从句
1．作动词的宾语：
Everybody knows that matter takes up space.
1 2．作介词宾语：
This depends on how hard you work.3．作形容词宾语：
They are confident that they can do it well.4．要注意的问题：
1）引导词that的省略：
I think (that ) you are right.2）形式宾语it：
He has made it clear that the meeting will not be postponed.3）否定意义的转移：
think, believe, suppose, expect, I don’t think he has time to play che with you.I don’t suppose it is the rush hour yet.4) 插入语疑问句：
I think that John will arrive at five o’clock.When do you think John will arrive? They said that they had cleaned the claroom.What did they say they had done?
表语从句
1．和be, seem, remain, look联系动词连用的表语从句：
My idea is that this plan should be carried out immediately.It looks that it is going to rain.2．Where, why, how 等引导的表语从句： That is why we called off the meeting.This is how we did it.注：主语是reason的表语从句that 要用引导，不要误用because: The reason (why) he was late was that he mied the bus.(不能用because)
同位语从句
同位语从句用于表示名词的内容，对其加以解释。常见的词有：fact, idea, news, conclusion.The doctor came to the conclusion that the patient was suffering from cancer.The discovery that every heavenly body has gravity was made by Newton.注：同位语从句和定语从句的区别：同位语从句是对前面名词的补充说明；定语从句则是对前面名词的修饰和限定。
The idea that one can do the work without thinking is wrong.（同位语从句）
The idea that you put forward at the meeting is wrong.（定语从句）
