英语基础语法名词性从句一、名词性从句的基本概念在复合句中起名词作用的从句叫名词性从句，包括作主语从句、表语从句、宾语从句和同位语从句。(1)主语从句就是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, why, whatever, whoever等引导。如：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。注：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.但是，由连接代词what, whatever, whoever等引导的主语从句一般不能用形式主语。如：Wha
