话不多说，今天给大家总结名词性从句的特点。欢迎大家批评指正。
名词性从句（一个句子做了名词的功能就叫做名词性从句）
陈述句
变化规则：that+陈述句=名词
Yaoming is tall.
1.That Yaoming is tall is a fact.
(主语从句)
2.we know (that) Yaoming is tall.
(宾语从句)
3.My opinon is that Yaoming is tall.
(表语从句)
4.The opinon that Yaoming is tall is right.
(同位语从句)
总结：从句在句子里做什么成分即为什么从句。
一般疑问句
变化规则：if/whether +疑问句的陈述语序=名词
Will you come to Beijing tomorrow?
1.Whether you will come to Beijing tomorrow is important to me .
(主语从句)
2.I want to know if/whether you will come to BJ tomorrow.
(宾语从句)
3.My question is whether you wil come to BJ tomorrow.
(表语从句)
4.The question whether you wil come to BJ tomorrow bothers me.
(同位语从句)
特殊疑问句
变化规则：陈述语序的特殊疑问句=名词
Why are you so clever?
1.Why you are so clever is a mystery.
(主语从句)
2.We don't kown why you are so clever?.
(宾语从句)
3.My question is why you are so clever interests me.
(表语从句)
4.The question why you are so clever interests me.
(同位语从句)
总结：1.名词性从句本质。
2.名词性从句包括（主语从句，宾语从句，表语从句，同位语从句），只要是名词可以充当的成分，就可以用名词性从句替换。
3.名词性从句结构：陈述句、一般疑问句、特殊疑问句。
补充：1.同位语从句，一般跟在抽象名词后面。（question，belief, idea, fact等）
2.当同位语从句充当主语过长时，通常置后。
An idea came to her that she could solve the problem in another way.
