主语从句PPT课件
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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）
It is a fact (a shame, a pity, good news…) that…
It is still uncertain whether he is coming or not. It is an honour that I was invited to attend the meeting.
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。
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4) . 用于It is important / natural / necessary / impossible that...句型中, 主语从句应使用虚拟 语气, 谓语动词用\“should + 动词原形\”的 形式, should有时可以省略。
That he will come and help us is certain. Whether we will succeed is still a question. It is not known if he will come.
注意: 已确定的事由that引导; 没决定的事由whether引导.
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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.
2
“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.
3
主语从句 （Noun Clauses as the Subject）
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.
5) 在It + be+suggested/advised/ordered/requested/ insisted/required 中, that从句的谓语也应 该用\“should + 动词原形\”的形式, should 有时可以省略。
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ቤተ መጻሕፍቲ ባይዱ
3. 主语从句需注意的问题 (1)主语从句中用陈述语序 What she is afraid of is their taking her to Paris. ( What is she afraid of … Wrong ) (2)主语从句后谓语动词用三人称单数 That they haven’t phoned is strange.
It doesn’t matter whether she will come or not.
It makes no difference where we shall have the meeting.
10
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.
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。
4
主语从句的连接词
1. 连 词 that( 无 词 义 , 不 作 成 分 , 不 能 省 略);whether(是否),if不能位于句首。
6
2)连接代词who ，what ，which, whatever, whichever, whoever
充当成分，有具体意义
What seems easy to some people seems difficult to others. Which side will win is not clear.
Noun Clauses ---The subject clause
By Debby
1
Grammar
What part does the underlined part serve as in each sentence?
A tree has fallen across the road. You are a student. To find your way can be a problem. Smoking is bad for you.
8
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.
5
主语从句常用it作形式主语放句首
因而我们常见到这种句式： It+be+n./adj/-ed从句（that, whether,etc.) 例：It's a pity that you should have to leave.
= That you should have to leave is a pity. It is great that I have a teacher like you. = That I have a teacher like you is great.
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）
It is a fact (a shame, a pity, good news…) that…
It is still uncertain whether he is coming or not. It is an honour that I was invited to attend the meeting.
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。
11
4) . 用于It is important / natural / necessary / impossible that...句型中, 主语从句应使用虚拟 语气, 谓语动词用\“should + 动词原形\”的 形式, should有时可以省略。
That he will come and help us is certain. Whether we will succeed is still a question. It is not known if he will come.
注意: 已确定的事由that引导; 没决定的事由whether引导.
9
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.
2
“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.
3
主语从句 （Noun Clauses as the Subject）
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.
5) 在It + be+suggested/advised/ordered/requested/ insisted/required 中, that从句的谓语也应 该用\“should + 动词原形\”的形式, should 有时可以省略。
12
ቤተ መጻሕፍቲ ባይዱ
3. 主语从句需注意的问题 (1)主语从句中用陈述语序 What she is afraid of is their taking her to Paris. ( What is she afraid of … Wrong ) (2)主语从句后谓语动词用三人称单数 That they haven’t phoned is strange.
It doesn’t matter whether she will come or not.
It makes no difference where we shall have the meeting.
10
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.
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。
4
主语从句的连接词
1. 连 词 that( 无 词 义 , 不 作 成 分 , 不 能 省 略);whether(是否),if不能位于句首。
6
2)连接代词who ，what ，which, whatever, whichever, whoever
充当成分，有具体意义
What seems easy to some people seems difficult to others. Which side will win is not clear.
Noun Clauses ---The subject clause
By Debby
1
Grammar
What part does the underlined part serve as in each sentence?
A tree has fallen across the road. You are a student. To find your way can be a problem. Smoking is bad for you.
8
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.
5
主语从句常用it作形式主语放句首
因而我们常见到这种句式： It+be+n./adj/-ed从句（that, whether,etc.) 例：It's a pity that you should have to leave.
= That you should have to leave is a pity. It is great that I have a teacher like you. = That I have a teacher like you is great.