高中英语必修三Unit4 主语从句
必修三Unit4主语从句
必修三Unit4主语从句(Subject Clause)➢定义:在句子中担当主语的是一个从句，这个从句就叫做主语从句。
➢位置：1.通常放在主句谓语动词之前That he will succeed is certain. Who will be our monitor hasn't been decided yet.Whether he will join us won't make difference. How the book will sell depends on its author. What caused the accident remains unknown.2.由形式主语it代替，而本身放在句子末尾。
It doesn’t matter whether he is wrong or not.➢辨别下列从句的类别(1-6)：主从；宾从；表从；主从；宾从；主从➢主语从句的连接词引导主语从句的连接词可分为三类：连接词：that, whether / if；连接代词：what, which who, whom, whose, whatever, whoever, whichever等；连接副词：when, where, how, why, whenever, wherever等。
●that:1.无词义；2.在主语从句中不作成分；3.一般不能省略（尤其在句首时）That he will come and help us is certain. That he is the best student in the class is obvious.●Whether / if: 1.有词义：“是否”；2.在主语从句中不作成分；3. whether引导的主语从句可放句首、句末；4. If引导的主语从句不能位于句首。
Whether we will succeed is still a question. If we will succeed is still a question. (×)It is not known whether / if he will come.what, whatever, who, whoever, whose, which, whicheverwhen, where，why, how等。
必修3：Unit4主语从句
summary
一、主语从句在句子中扮演主语的角色；
二、要不出现在句首，要不放在句末。
三、3种用法：
1. 由 -wh 引导 （what; who; when; where; why; how; whether…)
2. 由 that 引导
3. 由 It 做形式主语
1）It is + 名词 + 从句 2）It is + 形容词 + 从句 3）It + 动词（vi/vt) + 从句 (区分系动词) 4）It + 被动 + 从句
4）It + 被动 + 从句
It is reported that… 据报道……，
It is said that… 据说………
对比 what 和 that 的用法
用 what 和 that 填空。
1）_____ Trump did in public astonished the others. 2）_____ Trump did something in public astonished
状语从句 他养了条狗子，因为他寂寞。
主语从句是干啥的？
作主语的
主语从句的位置有 2 种情况： 1）主语从句 + 谓
谓 主
What you say is always right.
你说的都对。
主语从句的位置有 2 种情况： 2）it 作形式主语：It + 谓 + 主语从句
形式主语 谓
It is important that we eat well.
形式主语
主语从句
2）It is obvious that we can not finish the task on time.
必修三Unit4主语从句
必修三Unit4主语从句（Noun Clauses as the Subject）主语：是句子所要说明的人或事物，是句子的主体，主语的位置通常在句首，一般不省略，是谓语的陈述对象；表示句子说的是"什么人"、“什么事”、“什么东西”、“什么地方”等等。
通常名词、代词、数词、动名词、To do不定式、一个句子都可以做主语。
谓语：是对主语动作或状态的陈述或说明, 指出“做什么”、“是什么”或“怎么样”. 谓语动词的位置一般在主语之后。
找出句子的主语A tree has fallen across the road.You are a student.To find your way can be a problem.Smoking is bad for you.“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.在句中起主语作用的从句叫，它是名词性从句之一。
How the book will sell depends on its author.That he is the best student in the class is obvious主语从句用法归纳：(一)语序主语从句使用，其通常结构为“引导词+ 主语+ 谓语+ 其他成分”；但当连接代词同时充当从句主语时，其结构为“连接代词+ 谓语+ 其他成分”，。
That he will come and help us is certain.How the book will sell depends on its author.(二)引导词①that引导主语从句时，也任何成分，但通常省略.That they are badly in need of help is quite clear.但是这类句子在大多数情况下会放到整个句子的后部去，而用代词it作形式主语。
【高一同步教程】高中英语必修3 Unit4语法：主语从句讲解及练习
高中英语必修3 Unit 4语法教学案Section_ⅢGrammar—主语从句语法图解【探究发现】①What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.②The earth became so violent that it was not clear whether the shape would last or not.③What is even more important is that as the earth cooled down, water began to appear on its surface.④It was not immediately obvious that water was to be fundamental to the development of life.⑤What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.⑥So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.【我的发现】(1) 以上黑体部分在句中作主语。
(2) ①句中的what在从句中作表语，但⑤句中的what在从句中作宾语；③句中的what在从句中作主语。
(3) ②⑥句中的whether意为：是否。
高中英语必修三Unit4-主语从句
It happened that...
碰巧……
It occurred to me that…我突然想起…
It appears/seems that… 似乎，好像…
It turned out that… 原来…
*_I_t_h_a_p_p_e_n_e_d__t_h_a_t_(刚好)I was out yesterday.
主语从句的规律：
例4. That whether he will help others is a fact.
正：That he will help others is a fact.
规律四、主语从句中的连词不能重叠使用。
主语从句的规律： 例5. When he will come are a puzzle. 正：When he will come is a puzzle.
4) 连接副词when, where, how ,why
1.When we will leave（我们什么时候离开） hasn’t been decided. 2.How he got there (他怎么到那的） is a secret. 3. Why he cried (他为什么哭）is not clear. 4. Where the meeting （会议将在哪里举行） will be held is not known.
主语是？
Which part serves as subject in each sentence? 1. You are a student. 2. Smoking is bad for you. 3. To find your way can be a problem. 4. “How do you do?” is a greeting.
人教高中英语必修3Unit4主语从句 (共24张PPT)
. Rewrite the following sentences with a subject clause. 1.Do the other astronomers accept his ideas?
2.It remains a question.
Whether t_h_e__o_th_e_r__a_st_r_o_n_o_m__e_rs__a_c_ce_p_t__h_is_ i_d_e_a_s_r_e_m__a_in_s__a_q_u_e_s_t_io_n__
Thank you !
Remember always to Tell yourself:
It’s a fact that English is not ard to learn. It’s certain that I can learn English very well
by working hard. I love English!
（3）主语从句一般位于谓语__之__前____. 为避免主语过长,可以把主语从句移到句子末尾 用___i_t ___作为句子主语,
常见的句型为 It is said/reported that据说/据报道 It occurred to sb that 某人刚刚想到….. It happened that 碰巧… It turned out that 证明是 It’s no wonder that 难怪…..
What we could do was just waiting and praying.
Why the plane once changed its air line made people puzzled?
That the plane can not come back has been a fact .
高中英语 人教版必修三第四单元语法：主语从句
Unit4 Astronomy:the science of the stars主语从句（The Subject Clause）（一）主语从句概念：在复合句中充当主语的句子，叫做主语从句。
句子结构：“主语从句（引导词+主语+谓语..）+谓语动词+句子其它...”What he said is of great importance .他所说的很重要。
That prices will go up is certain .物价要上涨是肯定的。
（二）主语从句引导词：连词that（无词义），,whether（是否）连接代词who/ who（谁）, whose（谁的）,what（...的事）,which (哪一个）连接副词when（什么时候）,where（哪里）,how（如何/怎么）,why （为什么）（1）that引导主语从句，本身无词义，在从句中不做成分，但不可省略。
eg That Tom passed the exam made hisparents happy .汤姆通过（2）whether引导主语从句，意为“是否”，在从句中不做成分，不可省略，位于句首时不能用if 。
Whether we ‘ll go camping tomorrow dependson the weather.明天我们是否去野营取决于天气。
（3）what引导主语从句，意为“...的事，”在从句中做主语、宾语、表语，不可省略。
What is needed for the space trip is careful preparation .（what 在从句作主语）去太空旅行所需要的就是仔细的准备。
What they want is a good book.（what 在从句作宾语）他们想要的就是一本好书。
（4）其它特殊疑问词引导的主语从句：注意特殊疑问词引导的主语从句要用陈述语序。
Who will do it doesn’t matter.谁要做这件事没关系。
人教高中英语必修3Unit4主语从句(共17张PPT)
Subject Clause.
主语从句三要素
How he became a great scientist is
known to us all.
Is what you told me really true?
不谓从 能语句 省动用 略词陈 关常述 联用语 词单序
一, 主语从句的连接词
1. that 只起连接作用，本身无意义，不充当任何 成分，但不能省略。
That she left him made him heart-broken. That he is still alive is a good news to us.
That he was chosen made us very happy.
=>It made us very happy that he was chosen.
用it 作形式主语的结构(1)
(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
1. What you left are only several old books. 2. What you said is of great importance. 3. What he says and does doesn’t concern me. 4. What he says and does don’t agree.
tomorrow is not important. _W__h_ic_h__ class will win the football game is not clear. _W__h_o_ will meet him is not decided.
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Whatever and whoever
Whatever ＝ anything that Whoever ＝ anyone who
不管是谁犯了法，他都应该受到惩罚。
Whoever breaks the law should be punished。 ＝Anyone who breaks the law should
主语从句的规律： 例4. That whether he will help others
is a fact. 正：That he will help others is a fact.
规律四、主语从句中的连词不能重叠使用。
主语从句的规律：
例5. When he will come are a puzzle. 正：When he will come is a puzzle. 规律五、含主语从句的主句谓语动词多用 单数第三人称形式。
主语从句的规律： 例3. If the meeting will be put off
has not been decided yet. 正： Whether the meeting will be put off has not been decided yet.
规律三、whether 可以引导主语从句， 放在句首，但if不能
主语从句的规律：
1. What he needs is that book. 2. What he needs are some books.
小结：
主语从句可以放在前面也可以放在
后面。 用it作形式主语,把主语从句放在
句末。
主语从句的规律：
找出下列句子中的错误，并总结规律 例1.When will he come is not known.
正：When he will come is not known. 规律一、主语从句一律用陈述语序， 即主语在前，谓语在后。
3) It +不及物动词+that It happened that... 碰巧…… It occurred to me that…我突然想起… It appears/seems that… 似乎，好像… It turned out that… 原来…
It happened that 刚好)I was out yesterday. *________________(
主语从句的规律：
例2. He will not come to the meeting this evening is true.
正：That he will not come to the meeting this evening is true.
规律二、连词that 在从句中无实际意义， 但不能省略。
6. That we shall be late is certain. 7. It is certain that we shall be late.
“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. （句子充当主语，所以称为主语从句）
这样就构成了下面一些常用句型: 1) It is + n. +that It is a pity/shame that... 可惜的是…… It is a surprise that… 令人吃惊的是… It is a fact that… 事实是… It is common knowledge that … …是常识
名词性从句中的连接词
连词: that / whether / as if
(though);
连接代词: what / who/ which / whose
/ whatever / whoever / whomever / whichever，
连接副词: where / when / why / how
Complete the sentences using what, whether, where, when， who, why, how or that.
What is needed for success) is your hard work. 1.(_____ When/How they will arrive )has been told 2.(______ to the teacher. Where/wh ether we will go tomorrow )hasn’t 3.(_____ been decided yet.
*__________________( It occurred to me that我突然想起)I forgot to sent the letter.
4) It + be +过去分词+从句 It is said that... 据说…… It is known to all that... 众所周知…… It is reported that... 据报道…… It is believed that... 据相信… ;人们相信… It is suggested that + (should）do... 建议… It is reported that 据报道)20 people were *_________________( killed in the accident. It is suggested that 建议)we should eat *__________________( more vegetable and do more exercise.
Step3.
Step3.思考
主语从句一直位于句首的位置吗？ That he will pass the exam is certain. It is certain that he will pass the exam. 他一定会通过考试的.
注解：一般来说主语从句都是放在 句首 , 但有时为了使句子 保持平衡 ,避免”头重脚轻”, 常用 it 作 形式主语 ，从而把主语从句放在 后面 ．
主语是？
Which part serves as subject in each sentence? 1. You are a student. 2. Smoking is bad for you. 3. To find your way can be a problem. 4. “How do you do?” is a greeting. 5 .What she said is not yet known.
be punished.
4) 连接副词when, where, how ,why
1.When we will leave （我们什么时候离开） hasn’t been decided. 2.How he got there (他怎么到那的） is a secret. 3. Why he cried (他为什么哭）is not clear. 4. Where the meeting （会议将在哪里举行） will be held is not known.
Step 2、主语从句概念定义：
充当主语的名词性从句，因其在复合 句中做主语，又称主语从句。
主语从句的位置
That he will succeed is certain.
Whether he will come makes no difference. What we need is more time. 先找出谓语，主语在第二个谓语前面
/ wherever / whenever
判断下列划线句子是哪种名词性从句。 1.I don’t know whether he will come or not. 2.The question is whether he will come or not. 3.Whether he will come or not is unknown.
主语从句的特点：
1.引导词：
从属连词 that, whether；
连接代词 who, what, which；
whoever, whatever, whichever; 连接副词 when, where, how和why。
2. 语序：陈述句语序
引导词
1) 从属连词that和whether： • That he will come is certain. • Whether he will come is uncertain.
_____ that 不做成分，无意义，不能省略。 whether 不做成分，表“_______”。 是否
ห้องสมุดไป่ตู้
2) 连接代词who, what, which（做成分） 1. Who will go makes no difference. 谁去没什么不同。（主语）
2. What we need is more time.（我们 所需要的是更多的时间。）（宾语） 3.Which book I should buy hasn’t been decided. （定语） 我应买哪一本书还没有决定。
名词性从句——主语从句
什么叫名词性从句？
在句子中起名词作用的句子叫名词从 句 (Noun Clauses） 名词从句的功能相当于名词词组, 它 在复合句中能担任主语、宾语、表语、 同位语等 因此根据它在句中不同的语法功能， 名词从句又可分别称为主语从句、宾语 从句、表语从句和同位语从句
主语从句 subject clause 名词性从句 noun clause 宾语从句 object clause 表语从句 predicative clause 同位语从句 appositive clause