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1、名词性从句之主语从句 张雪Professor Zhang is a famous sicentist. Our success or failure depends on the countrys economy. We often speak English in class.One-third of the students in this class are girls.To master a foreign language is necessary. Playing football in the street is dangerous.1. Professor Zhang is a
2、 famous sicentist. Our success or failure depends on the countrys economy. (名词）名词）2. We often speak English in class. （代词）（代词）3. One-third of the students in this class are girls. （数词）（数词） 4. To swim in the Lijiang River is a great pleasure. To master a foreign language is necessary. （动名词）动名词） 5. Pl
3、aying football in the street is dangerous. （动名词）（动名词） 6. In new China the old are living a happy life. (形容词化名词）形容词化名词）That he will succeed is certain. Whether she will go there is not known. What she said is not true.Who broke the window has not been found out.主语从句：主语从句：主语从句在复合句中作主句的主语，主句谓语主语从句在复合句中
4、作主句的主语，主句谓语动词为动词为第三人称单数第三人称单数。引导主语从句的引导词有三类：引导主语从句的引导词有三类：1) 连接代词连接代词what ,who(whom),which,whoseWhat he said is true.Who will come to help us is still unknown.Whoever is here gets a prize.Whatever I have done is only for you.2) 连接副词连接副词:when,where,why,how (how long,etc.)When well have the sports mee
5、t will be discussed tomorrow.How soon the plane will arrive at Beijingdepends on weather.How Thomas Edison became a great inventor is know to all.Why he failed the physics exam wasnt clear.Where he has been is still a puzzle.3) 连接词连接词:that ,whetherThat the moon is the satellite of the earth is known
6、 to us all.Whether Ill attend the concert or not doesnt matter much.常用常用it 作形式主语的句型：作形式主语的句型：It is + 名词名词 + noun clauseIt is a surprise that he isnt here.It is a question whether we can find this.It is + 形容词形容词 + noun clauseIt is probable that she told him everything.It is strange that he didnt pass
7、 the exam.It is + 不及物动词不及物动词 + noun clauseIt doesnt matter when theyll be back.It so happened that I was out that day.It is + 分词分词 + noun clauseIt is reported that the concert will last 3 days.It is disappointing that he didnt come.4) it常用来作为形式主语放在句首代替主语从句常用来作为形式主语放在句首代替主语从句.必须用必须用it替代主语从句，替代主语从句， 放
8、在句首的。放在句首的。1）主句是被动语态时）主句是被动语态时 It hasnt been decided whether they will go there.2）主句是疑问式或感叹句时）主句是疑问式或感叹句时 。 Is it possible that hell come? How strange it is that the children are so quiet!*用用whatever,whoever等引导的主语从句不能等引导的主语从句不能用用it作形式主语作形式主语. Whoever doesnt obey the rules should be punished.*that 引导
9、的主语从句放在句首时引导的主语从句放在句首时that不能省不能省略略. That he will come is known to all.*if 不能代替不能代替whether Whether she will come is unknown.判断对错判断对错It is true what he said.FIf he left or not is unkown.FWhat she bought were some apples.TIt was in Paris where they met for thefirst time.FHow the prisoner escaped is a mystery.THe left is certain.FWhen will he come is not knownF