主语从句讲解ppt课件
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Subject Clauses 主语从句
定义： 用作主语的从句叫主语从句,它是名词性从句之一.
1百度文库
What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.
It’s certain . we’ll be late.
It’s certain that we will be late. That we’ll be late is certain.
Is he coming or not ？ We don’t know whether he is coming
That price will go up is certain. That he will come is certain. Whether we go by train or by boat makes no difference. Whether he’ll come here isn’t clear.
6
总结：引导主语从句的连接词有： 从属连词: that, whether； 连接代词: who (whoever), whom, whose, what (whatever)和which (whichever)； 连接副词: when, where, how和why。
7
Make sentences :
表语
What is even more important is that as the earth cooled down, water began to appear on its surface.
主语
What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acid into the oceans and seas.
We don’t know
or not .
Whether he is coming is not known.
What does he want to
tell us?
We don’t know what he wants to tell us.
We don’t know
What he wants to tell us is not known.
例:
That we shall be late is certain. -- It’s certain that we shall be late.
1. That the earth is round is known to all. -- It’s known to all that the earth is round.
3
The earth became so violent that it was not clear whether the shape would last or not.
It was not immediately obvious that water was to be fundamental to the development of life.
2. That you missed the chance is a pity.
-- It is a pity that you missed the chance.
9
2. 用it 作形式主语的结构
A. It + be + 形容词 + that 从句
(obvious, true, surprising, good, wonderful, funny, possib
5
Why they suddenly disappeared still remains a mystery.
3)连接副词when，where， how，why等, 在从 句中做状语。
How this happened is not clear to anyone. When he will be back depends on the weather. When we’ll start tomorrow will be told soon. Where the test will be given is not yet decided.
When will you come back? It doesn’t matter.
It doesn’t matter when you will come back. When you will come back doesn’t matter.
8
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.
So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
4
从属连词：that， whether 引导主语从句只起引导作用， 在主语从句中不充当任何成分，that本身无实际意义，但 不能省略. whether意为“是否”，放在句首句末皆可。
宾语
2
1)连接代词 what (whatever ),
who ( whoever) , which (whichever), whom, whose .
连接代词引导主语从句，在句中作主语，宾语，表语， 定语。
Which side will win is not clear. 定语 Who will write the poem has not been decided yet.主语 Whatever he did is right. 宾语 What the city will be still remains a mystery. 表语
定义： 用作主语的从句叫主语从句,它是名词性从句之一.
1百度文库
What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.
It’s certain . we’ll be late.
It’s certain that we will be late. That we’ll be late is certain.
Is he coming or not ？ We don’t know whether he is coming
That price will go up is certain. That he will come is certain. Whether we go by train or by boat makes no difference. Whether he’ll come here isn’t clear.
6
总结：引导主语从句的连接词有： 从属连词: that, whether； 连接代词: who (whoever), whom, whose, what (whatever)和which (whichever)； 连接副词: when, where, how和why。
7
Make sentences :
表语
What is even more important is that as the earth cooled down, water began to appear on its surface.
主语
What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acid into the oceans and seas.
We don’t know
or not .
Whether he is coming is not known.
What does he want to
tell us?
We don’t know what he wants to tell us.
We don’t know
What he wants to tell us is not known.
例:
That we shall be late is certain. -- It’s certain that we shall be late.
1. That the earth is round is known to all. -- It’s known to all that the earth is round.
3
The earth became so violent that it was not clear whether the shape would last or not.
It was not immediately obvious that water was to be fundamental to the development of life.
2. That you missed the chance is a pity.
-- It is a pity that you missed the chance.
9
2. 用it 作形式主语的结构
A. It + be + 形容词 + that 从句
(obvious, true, surprising, good, wonderful, funny, possib
5
Why they suddenly disappeared still remains a mystery.
3)连接副词when，where， how，why等, 在从 句中做状语。
How this happened is not clear to anyone. When he will be back depends on the weather. When we’ll start tomorrow will be told soon. Where the test will be given is not yet decided.
When will you come back? It doesn’t matter.
It doesn’t matter when you will come back. When you will come back doesn’t matter.
8
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.
So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
4
从属连词：that， whether 引导主语从句只起引导作用， 在主语从句中不充当任何成分，that本身无实际意义，但 不能省略. whether意为“是否”，放在句首句末皆可。
宾语
2
1)连接代词 what (whatever ),
who ( whoever) , which (whichever), whom, whose .
连接代词引导主语从句，在句中作主语，宾语，表语， 定语。
Which side will win is not clear. 定语 Who will write the poem has not been decided yet.主语 Whatever he did is right. 宾语 What the city will be still remains a mystery. 表语