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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高考真题汇编-主语从句1.(2015•江苏）25._____ Li Bai, a great Chinese poet, was born is known to the public, but some won’t accept it.A. ThatB. WhyC. WhereD. How 答案：C解析：句意：李白是中国一位伟大的诗人，他的出生地是众所周知的，但有些人不愿接受这一事实。
分析句子结构可知，a great Chinese poet做Li Bai的同位语，is前面是主语从句。
比较选项只有where符合句意，where在从句中做地点状语。
故选C项。
【考点定位】名词性从句【名师点睛】此题由于“a great Chinese poet”的插入，句子结构变得稍显复杂，因此要求考生能够排除结构干扰，看清考点还是考查名词性从句连接词的选择，然后根据“从句部分缺什么补什么的原则选则连接词”这一根本原则，同时结合句意，迅速锁定正确答案。
2.(2015•北京）35. _____we understand things has a lot to do with what we feel.A. WhereB. HowC. WhyD. When答案：B解析：句意：我们如何理解事情与我们所感受的有很大关系。
根据句意可知，主语从句缺少方式状语，因此选择how。
故选B。
【考点定位】主语从句【名师点睛】主语从句分多种，解题时要分析原题空中缺少的是何种状语。
这类题考生首先要利用主句与从句之间的逻辑关系判别，尤其是连词在从句中的功能，由于引导主语从句的连词功能有所分别，较为容易抉择，但有的连词的形式一样，但具有不同意思，这就需要考生仔细甄别，充分利用与之相关内容或与其搭配相关词语的意思。
3. (2014•全国大纲卷）Exactly ________ the potato was introduced into Europe is uncertain, but it was probably around 1565.A. whetherB. whyC. whenD. how答案：C解析：考查主语从句的连接词。
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。
必修三Unit 4 Grammar 导学案学习目标：1. 理解主语从句的基本概念和用法2. 掌握主语从句中常考点和难点3. 复习宾语从句和表语从句预习案一．将下列句中主语划线。
1. You are a student.2. Smoking is bad for you.3. To find your way can be a problem.4. Energy is what makes things work.5. What she said is not yet known.6. We are discussing how we will deal with the problem.7. That we shall be late is certain. 8. It is certain that we shall be late.二．观察上面句子并回答。
_______,________,_________可作主语，通常放在句子_________.主语从句：_________________________________________。
上面八句中第___________句是宾语从句，第____________句为表语从句，第_______句为主语从句。
探究案一．观察that 用法并归纳总结。
１That she was chosen made us very happy.２．The trouble is that I have lost his address.３．The teacher said (that ) the sun rises in the east and sets in the west.以上that 分别引导的_______从句_____________从句、__________ 从句。
that 在主语从句和表语从句中__________省略，但在宾语从句中__________省略。
