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1、非常实用的名词性从句的语法知识在高中英语的语法中，最繁琐的莫过于从句了，而最常见的从句正是名词性从句，熟练地掌握名词性从句的语法知识，不管是单独句子的选择题，还是阅读理解翻译中的长句子，或是在写作中想要运用复杂句型来给自己的英语作文加分，都是大大有利。今天，我们就一起来看看一些非常实用的名词性从句的语法知识吧。什么是名词性从句？在复合句中起名词作用的从句叫名词性从句，包括：主语从句、表语从句、宾语从句和同位语从句。a,主语从句顾名思义，在复合句中作主语的从句。主语从句常用that, whether, who, whom, whose, what, which, when, where, how
2、, why, whatever, whoever等引导。例句：Whether he will be able to come remains a question.他是否来还是问题。That China is a great socialist country is well known.众所周知，中国是一个伟大的社会主义国家。特别强调：为避免头重脚轻，使句子平衡，常用it作形式主语，而将主语从句后置。如上述第二例常说成：It is well known that China is a great socialist country.另外，由连接代词what,whatever,whoever等
3、引导的主语从句一般不能用形式主语。例句：What he found surprised me greatly.他的发现使我非常吃惊。Whoever is finished may rest.凡是做完工的人都可以休息。b,表语从句表语从句的功能等同于表语，就是在连系动词之后作表语的从句。引导表语从句的连接除与引导主语从句的连接词外，还有as if，as though。如：The question is whether he is able to do it alone.问题是他能否单独做这件事。It looks as if(though)it is going to snow.天好像要下雪似的。
4、特别强调：要区分以下句式：thats why+结果; thats because+原因。the reason why/foris that例句：He is absent.Thats because he is ill.他缺席，这是因为他生病了。He is ill.Thats why he is absent.他病了，这就是他缺席的原因。The reason why he is absent is that he is ill.他缺席的原因是他生病了。c,宾语从句宾语从句，就是在复合句中作宾语的从句。引导宾语从句的连接词与引导主语从句的连接词基本相同。如：They didnt say which
5、 they wanted.他们没有说他们想要哪一个。I am sure(that)no harm will ever come to you.我肯定你永远不会受伤害。I was surprised at what has happened.我对发生的事感到惊讶。特别强调：当think,believe,suppose等的疑问式后面跟连接代词或连接副词引导的宾语从句时，习惯上将这些连接词置于句首，即“连接代/副词+do you think/believe/expect+宾语从句的其余部分?”例句：Who do you think is the best player this year?你认为今年
6、谁是最佳运动员?What do you suppose you will do after school?你想放学后干什么?d,同位语从句就是在句中作同位语的从句。它通常有放在thought, idea, news, word, plan, doubt, question, fact, suggestion, belief等抽象名词的后面，说明这些词的具体内容或含义。同位语从句大多由that引导，也可由whether, how, when, where, why等引导，但不能由which引导。例句：The idea that the earth is round is not a new one.“地球是圆的”这种观点并不新鲜。He must answer the question whether he agrees to it or not.他必须回答他是否同意此事这们一问题。I have no idea when he will set out.我不知他什么时候出发。特别强调：有时，同位语从句并不紧跟在它所说明的词的后面。例句：The whole truth came out at last that he was a wolf in sheeps clothing.真相终于大白了，他原来是一只披羊皮的狼。
