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。

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。

Section Ⅲ Grammar —主语从句在主从复合句中，充当主语的从句，即为主语从句。

一、主语从句的连接词1．连接词that和whether(1)that在从句中不充当任何句子成分，只起连接作用，但不可省略。

①That Whitney Houston died upset her fans all over the world.惠特尼·休斯顿的离世令全世界的粉丝感到难过。

(2) whether在从句中不充当任何句子成分，起连接作用，意为“是否”，不可省略。

②Whether the plan will be carried out is still unknown.这个计划是否会实施还不知道。

即学即练11－1.完成句子①她能来帮助我们使我们很高兴。

_________________________ made us very happy.②他被选为(be chosen as)志愿者(volunteer)让我们感到高兴。

____________________________ made us happy.③我们明天是否举行派对取决于天气。

____________________________ depends on the weather.④(湖南高考)Everyone in the village is very friendly. It doesn't matter ________ you have lived there for a short or a long time.A．why B．HowC．whether D．when2．连接代词(who，whose，whom，what，which，whichever，whoever, whomever, whatever连接代词引导主语从句，在从句中可以作主语、宾语、表语或定语。

①Who will take his place is not important.谁将代替他并不重要。

必修3-u n i t4主语从句1主语从句【教学内容】主语从句【教学目标】熟练掌握不同连接词引导的主语从句【教学重难点】连接词的使用、It作形式主语的常见句型【教学过程】●什么是主语从句：在主句中起主语作用的从句称为主语从句。

Eg:I need a good meal.(I是主语）What I need is a good meal.（What I need 整句话作主语）●其连接代词主要有三类：①从属连词：that,whether,if②连接代词：who(ever),whom(ever),whose(ever),what(ever),which(ever)③连接副词：when(ever),where(ever),how(ever),why▼that 引导的主语从句①that置于句首的主语从句从属连词that在主语从句中不作任何成分，也没有实际意义，只起连接作用。

→That he will come to the conference has excited every one of us.他要来参加会议这使我们每一个人都十分激动。

→That in some countries women are still treated unequally is unfair.在一些国家妇女仍然受到不平等对待是不公平的。

②形式主语it替代主语从句常见的it替代主语从句的句式主要有如下几种：► It+be+形容词（certain,clear,necessary,likely,obvious,probable,etc.)+that从句：→It is certain that most of the farmers have brought in more money by all means.很明确大多数农民通过各种方式赚了很多钱。

→It is likely that there will be a snowstorm tomorrow.很可能明天会有一场暴风雨。

主语从句【教学内容】主语从句【教学目标】熟练掌握不同连接词引导的主语从句【教学重难点】连接词的使用、It作形式主语的常见句型【教学过程】●什么是主语从句：在主句中起主语作用的从句称为主语从句.Eg：I need a good meal.（I是主语)What I need is a good meal.（What I need 整句话作主语）●其连接代词主要有三类:①从属连词：that，whether,if②连接代词：who（ever）,whom(ever），whose（ever),what(ever)，which（ever)③连接副词：when(ever），where（ever）,how（ever),why▼that 引导的主语从句①that置于句首的主语从句从属连词that在主语从句中不作任何成分，也没有实际意义，只起连接作用。

→That he will come to the conference has excited every one of us.他要来参加会议这使我们每一个人都十分激动。

→That in some countries women are still treated unequally is unfair。

在一些国家妇女仍然受到不平等对待是不公平的。

②形式主语it替代主语从句常见的it替代主语从句的句式主要有如下几种：► It+be+形容词（certain,clear，necessary，likely,obvious,probable，etc.）+that从句：→It is certain that most of the farmers have brought in more money by all means.很明确大多数农民通过各种方式赚了很多钱.→It is likely that there will be a snowstorm tomorrow。

很可能明天会有一场暴风雨。