高一英语必修3名词性从句---主语从句和表语从句导学案
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Noun Clauses (名词性从句) 导学案
Part1.主语从句（Noun Clauses as the Subject）
一．导学
【什么是名词性从句？】
原来名词性从句是从另一个角度所命名的从句，即在句中起名词作用的从句就叫名词性从句名词性从句包括，，，。
定义-----用作的从句就叫主语从句，它是名词性从句之一。
Step1：感悟下列各句的主语并且划出下列句中的主语：(标出词性)
1. You are a student
2. A tree has fallen across the road.
3. Smoking is bad for you.
4. To find your way can be a problem.
5. It is impossible to finish this task in half an hour.
6. 30 years has seen the changes in our hometown.
Step2.认识主语从句，主语从句在从句中作主语。
1).What is needed for the space trip is careful preparation.
2).Whether wild life can be well protected is of great importance.
3).Who will go makes no difference.
4).Which kind of food is the best is still not certain.
5).When they will have a new restaurant opened has not been decided yet.
6) How gold was found there is not clear.
7). Why there is gravity is hard to understand.
8）It is our duty that we students clean the classroom every day.
思考与探究：<1> 作主语的可以是
<2> 从句用什么语序？
<3> 8)句子的主语怎么不在句首？
★注意:
1. That-从句作主语通常用it作先行词，而将that-从句置于句末，例如：
It is true that the earth is round.
It's a pity that you should have to leave.你非走不可真是件憾事。
2.表示“是否”意义时，用whether 而不用if引导主语从句，
Whether she will come or not is still a question .（但如果有形式主语it引导时，既可用whether，也可用if）。
3.有时可用形式主语it 代替主语从句：
e.g. It is still a question whether she will come or not . =It has not been decided yet when they will start .
★用it作形式主语的that-从句有以下四种不同的搭配关系：
a.It + be +形容词+ that-从句
It is necessary that…有必要……It is important that…重要的是……
It is obvious that…很明显……
b. It + be + -ed 分词+ that-从句
It is believed that…人们相信……It is known to all that…众所周知……It has been decided that…已决定……
c. It + be +名词+ that-从句
It is common knowledge that….....是常识It is a surprise that…令人惊奇的是……
It is a fact that…事实是……
d. It +不及物动词+ that-分句
It seems/appears that…似乎……It happens that…碰巧……
It occurred to me that …我突然想起……
Step 3：寻规找矩：请划出下列各句的主语(部分)。
1. That she was chosen made us very happy.
2. Who will go to the concert is not known.
3. Whether she will come or not is still a question.
4. Which book they will choose is still unknown.
5. When we shall hold our sports meet is not decided.
6. Why dinosaurs died out remains a puzzle.
7. How they will solve the serious problem today has not been decided.
8 . What surprised me most was that the little girl could play the violin so well.
9. Whoever leaves the room last ought to turn off the lights.
10. It’s strange that he knows nothing about it.
11. It is a pity that she has made such a mistake.
12. It is said that President Hu Jingtao will visit our school next week.
[小结归纳]主语从句的引导词有：
_________________________________________________________________________________________ ________________________________________________________________________________________ ★what与that在引导名词性从句时的区别:
what引导名词性从句时在从句中充当句子成分,如主语,宾语,表语. 而that则不然,它在句子