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1、主语从句定义：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。主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语 it 代替，而 本身放在句子末尾。主语从句主要有三类：（1）由连词 that 引导的主语从句:引导词 that 无含义,在句中不做成分,不可以省。 That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.（2）用连词whether引导的主语从句:whether有
2、含义（是否），在句中不做成分，不可以省。 Whether she is coming or not doesnt matter too much.（ 3） 用连接代词引导的主语从句 （在由连接代词 who， whose， whom， which， what， whoever， whomever， whichever， whatever 引导的名词性从句中，其连接代词在句中起名 词性作用，担当一定成分）.What you need is more practice.What I want to know is this.Whatever we do is to serve the people.
3、（4）用连接副词when, where, why, how引导的名词性从句（其连接副词有含义，在句中作状 语。 ）eg:Where we should leave it is a problem.When they will come hasnt been made pubic.ATTENTION1.it 做形式主语,而将主语从句放在句末（尤其是当谓语较短时）。例如：That light travels in straight lines is known to all.=It is known to all that light travels in straight lines.When
4、the plane is to take off has not been announced .= It has not been announced when the plane is to take off.（当 what引导的主语从句表示“.的东西”时，一般不用it作形式主语。）What he wants is a book. 他想要的是本书。Has it been settled who will be sent to carry out the task ? 固定用法和译法（1） It is +名词+从句It is a fact that. 事实是.It is good news
5、that . 是好消息It is a question that . 是个问题It is common knowledge that . 是常识类似的名词还有： a pity；a wonder；a good thing； no wonder； surprise 等。 例如： It is a mystery to me how it all happened.It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.(2) It is +形容词+从
6、句It is necessary that . 有必要.It is clear that . 很清楚.It is likely that . 很可能.It is important that . 重要的是.类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.It is obvious that conductors
7、 and insulators are both important in industry.It is doubtful whether she will be able to come.It was really astonishing that he refused to talk to you .It is essential that he should be here by the weekend .It seems obvious that we can not go on like this.（3）It is +过去分词+从句It is said that 据说It is re
8、ported that 据报道It has been proved that 已证明It must be proved that. 必须指出类似的过去分词还有： known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc. It is thought that he is the best player.It is estimated that the vase is 2000 y
9、ears old.It is used to be thought that a new star must be due to a collision between two stars.It has not been made clear when the new road is to be opened to traffic.It does not matter if I missed my train, because there is another later.It happened that I saw him yesterday.当“及物动词 + 宾语”较短时，也可用这种结构。
10、It shocked me that Peter did not tell anybody where he was.It does not interest me whether you go or not.2.只用 whether 不用 if 引导主语从句. 主语从句三要点 请观察下列句子，注意划线部分句子的意义及用法。1. What surprised me most was that the little girl could play the violin so well.2. Who will go to the concert is not known.3. That she w
11、as chosen made us very happy.4. Whether she will come or not is still a question.5. Which book they will choose is still unknown.6. When we shall hold our sports meet is not decided.7. Its strange that he knows nothing about it.8. It is a pity that she has made such a mistake.9. It is said that Pres
12、ident Jingo will visit our school next week.小结归纳（一）语序 主语从句使用陈述语序，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”，如句 1、2。（二）引导词that引导主语从句时无词义，也不充当任何成分，但通常不可以省略，如句3； whether 引导主语从句时意为 “ 是否 ” ，通常不能用 if 来代替 , 如句 4 ； 可以引导主语从句的连接代词主要有： who, whom, whose, what, which, whatever, whoever
13、等，如句 5； 可以引导主语从句的连接副词主要有： where, when, how, why 等，如句 6 。 （三）常见句型有时为避免句子头重脚轻，常用 it 作形式主语，代替主语从句放在句首，而把主语从 句置于句末。常用句型如下： It + be + 形容词 + that 从句， 如句 7; It + be + 名词 + that 从句， 如句 8; It + be + 动词的过去分词 + that 从句， 如句 9 。 即学即用I. 用适当的词填空，使句子意思完整。1. he didnt attend the meeting yesterday wasnt quite clear.2.
14、 The Foreign Minister said, “It is our hope the two sides will worktowards peace.”3. team will win the match is still unknown.4. comes to the party will receive a present.5. Mary has left is still a question.6. Its reported three people were killed in the accident and five werehurt badly.7. he solve
15、d the problem successfully interested all of us.8. We usually think we cant get seems better than what we have.9. It is a fact English is being accepted as an international language.10. is to be sent there to solve the problem hasnt been decided.II. 下列各句中均有一处错误，请改正。1. That the old mans son wanted to know was where the gold had been hidden.2. It is reported when China has successfully sent Shenzhou VI spaceship into space.3. If he can finish his task on time is of great importance.4. Whether the 2008 Olympic Games will be held in Bei
