主语从句PPT课件-从句讲解ppt课件
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It is an honour that I was invited to attend the meeting.
It is certain that she will do well in her exam. It is true that I told her everything. It is said that Mr. Green has arrived in Beijing. It is reported that China has sent another manmade earth satellite into orbit.
误：They should like each other is natural. 正：That they should like each other is natural. 正：It is natural that they should like each other. 2)如果主语从句放在句首，不能用if引导，但 是如果用it 做形式主语，而把主语从句放在 句末时，也可以用if引导. 误：If Mary really heard him is really doubtful. 正：It was doubtful if Mary really heard him.
It makes no difference where we shall have the meeting.
3) It +及物动词（被动语态）+主语从句
It has been decided that the exhibition will not open on Sundays.
注意:
1）主语从句在句首时，必须由连接词引导， 不能省略这些连接词；但是如果用it做形式 主语，而把主语从句放在句末时，从属连词 that可以省略。
2）It+不及物动词+主语从句 It seemed (happened, doesn’t matter, has turned out) that…
It happens that they were absent. It seems that Alice is not coming to the party at all. It doesn’t matter whether she will come or not.
3)连接副词when，where， how， why等。
Why he did it remains a mystery. When they will start is not known yet. How he became a great scientist is known to us all.
2.位置： 主语从句可以前置，也可以 后置。用it做形式主语，而把主语从 句，在句末，常用下面几种句型。
1）It + be + 表语 +主语从句
表语：（名词， 形容词，过去分词）
Hale Waihona Puke Baidu
It is a fact (a shame, a pity, good news…) that…
It is still uncertain whether he is coming or not.
“How do you do?” is a greeting.
What she said is not yet known.
That we shall be late is certain.
It is certain that we shall be late.
Make sentences
It’s certain . we’ll be late. Is he coming or not ？
What does he want We don’t know what he wants to tell us. to tell us? What he wants to tell us is not known. We don’t know When will you come back? It doesn’t matter. When you will come back doesn’t matter. It doesn’t matter when you will come back.
Whether it will please them is not easy to say.
2)连接代词who ，what ，which, whatever, whichever, whoever
What seems easy to some people seems difficult to others. Which side will win is not clear.
1.连接词： 1）从属连词：that， whether等. that 引导主语从句只起引导作用，本身 无实际意义，在主语从句中不充当任何 成分，但不能省略。 That she left him cut him to the heart.
That he will come is certain.
由whether及其他连词引导的主语从句 放在句首，句后都可。
It’s certain that we will be late. That we’ll be late is certain. We don’t know whether he is coming or not Whether he is coming is not known.
We don’t know
主语从句 （Noun Clauses as the Subject）
定义： 用作主语的从句叫主语从句，它是名 词性从句之一。引导主语从句的连接词有：
连词that, whether；连接代词who,
what和which；连接副词when, where, how和why。
主语从句：
做主语用的名词性从句，因其在复合句中做 主语，又称主语从句，引导主语从句的有连 词that ，whether， 连接代词who ，what ， which， 连接副词when，where， how， why等。
It is certain that she will do well in her exam. It is true that I told her everything. It is said that Mr. Green has arrived in Beijing. It is reported that China has sent another manmade earth satellite into orbit.
误：They should like each other is natural. 正：That they should like each other is natural. 正：It is natural that they should like each other. 2)如果主语从句放在句首，不能用if引导，但 是如果用it 做形式主语，而把主语从句放在 句末时，也可以用if引导. 误：If Mary really heard him is really doubtful. 正：It was doubtful if Mary really heard him.
It makes no difference where we shall have the meeting.
3) It +及物动词（被动语态）+主语从句
It has been decided that the exhibition will not open on Sundays.
注意:
1）主语从句在句首时，必须由连接词引导， 不能省略这些连接词；但是如果用it做形式 主语，而把主语从句放在句末时，从属连词 that可以省略。
2）It+不及物动词+主语从句 It seemed (happened, doesn’t matter, has turned out) that…
It happens that they were absent. It seems that Alice is not coming to the party at all. It doesn’t matter whether she will come or not.
3)连接副词when，where， how， why等。
Why he did it remains a mystery. When they will start is not known yet. How he became a great scientist is known to us all.
2.位置： 主语从句可以前置，也可以 后置。用it做形式主语，而把主语从 句，在句末，常用下面几种句型。
1）It + be + 表语 +主语从句
表语：（名词， 形容词，过去分词）
Hale Waihona Puke Baidu
It is a fact (a shame, a pity, good news…) that…
It is still uncertain whether he is coming or not.
“How do you do?” is a greeting.
What she said is not yet known.
That we shall be late is certain.
It is certain that we shall be late.
Make sentences
It’s certain . we’ll be late. Is he coming or not ？
What does he want We don’t know what he wants to tell us. to tell us? What he wants to tell us is not known. We don’t know When will you come back? It doesn’t matter. When you will come back doesn’t matter. It doesn’t matter when you will come back.
Whether it will please them is not easy to say.
2)连接代词who ，what ，which, whatever, whichever, whoever
What seems easy to some people seems difficult to others. Which side will win is not clear.
1.连接词： 1）从属连词：that， whether等. that 引导主语从句只起引导作用，本身 无实际意义，在主语从句中不充当任何 成分，但不能省略。 That she left him cut him to the heart.
That he will come is certain.
由whether及其他连词引导的主语从句 放在句首，句后都可。
It’s certain that we will be late. That we’ll be late is certain. We don’t know whether he is coming or not Whether he is coming is not known.
We don’t know
主语从句 （Noun Clauses as the Subject）
定义： 用作主语的从句叫主语从句，它是名 词性从句之一。引导主语从句的连接词有：
连词that, whether；连接代词who,
what和which；连接副词when, where, how和why。
主语从句：
做主语用的名词性从句，因其在复合句中做 主语，又称主语从句，引导主语从句的有连 词that ，whether， 连接代词who ，what ， which， 连接副词when，where， how， why等。