1、名词从句：在句子中起名词作用的各种从句统称为名词从句。使用陈述语序。根据它们在句子中所起的语法作用，这类从句包括主语从句、宾语从句、表语从句和同位语从句。,一 、主语从句,1.主语从句可以直接放在句首；也可用it作形式主语，而将从句放在句末。,1.When we shall have our sports meet is still a question.,2.It is still a question when we shall have our sports meet. (我们什么时候开运动会仍然是个问题。),3.Where she has gone is not known yet.
2、(她到哪儿去了还不知道。),4.Why he didnt come wasnt quite clear. （他为什么不来还不太清楚。）,由that引导的主语从句 ，that在主语从句中不起句子成分作用，但不能省略。,2.That all people will die is a terrifying fact.,由that引导的主语从句大多数要放到句末 ，一般用it作形式主语，因此上句可以改为：,3.It is a terrifying fact that all people will die.,2. 由that引导的主语从句,1.That the pop star has died is
3、known to the world.,二、宾语从句,宾语从句的作用相当于一个名词，它可以作动词的宾语，也可作非谓语动词、某些介词和某些形容词的宾语。,1. Please give me some advice on whether I should go to university or go to work when I graduate from high school.,2.I want to know what happened to her that day.,三 、表语从句,表语从句放在连系动词（be，seem，remain等）后,1.The question is who wi
4、ll go there. 问题是谁愿意去那里。,2.This is how I did it. 我就是这样做的,3.The reason for his absence was that he fell ill. 原因是他病倒了。,四、同位语从句,同位语从句跟在一个名词后，对其内容做进一步的解释：,1.I had no idea that you were here. 我不知道你在这儿。,2.The fact that he didnt pass the exam surprised me. 他考试没通过的事实使我很吃惊 。,同位语从句与定语从句的区别,1、从意义上讲，同位语从句对先行词的内容
5、加以解释，定语从句对先行词进行修饰和限定。,2.定语从句的先行词一般没有特殊性，而同位语从句前的名词往往是以下这些：,belief, fact, hope, idea, doubt, news, rumor, conclusion, evidence, suggestion, problem, order, answer, decision, discovery, explanation, information, opinion, possibility, truth, promise, report, statement,1.The news that they won the match
6、 is true. 他们比赛获胜的消息是真的,that they won the match 是同位语从句,解释news的内容 。,2.The news that you told us yesterday is true. 你昨天给我讲的消息是真的。,that you told us yesterday是定语从句，修饰先行词 news。,请判断下面两个句子中的that从句的性质：,五、 由what=all that引导的名词从句。 what的意思是：什么；所的(一切/样子/关系)。,1.What I told you is true. 我告诉你的事是真的。,2.What I want to know is this. 我想知道的就是这个。,3.What he is interested in is whether he has been admitted to Oxford University.,4.He was punished due to what he had done to the public.,5.What we need is water. 6.What we need are useful books.,主语为从句时，谓语动词一般要用单数形式；但如果what引导的从句作主语，代表复数概念（常可从表语上看出）时，谓语动词则常用复数形式。,
