whatyousaidwastrue句子成分

What you said was true.中文意思是:你说的话是真的。这是一个主语从句，what you said做的是主语。was是谓语，true是表语。实际上它是一个主系表结构的复句。

举一个相似的例子吧。 What you said made me happy.你说的话使我高兴。主语是what you said，谓语是made，宾语是me，补语是happy。

whatyousaidwastrue句子成分

What he said（主语） is（系动词） true（表语） .

What he said是个主语从句

名词性从句既然做名词使用，那么充当句子名词的作用时，就有了：主语从句，表语从句，宾语从句和同位语从句。

①主语从句 （在复合句中充当主语成分的从句叫做主语从句）

It's certain that prices (主语从句） will go up.

Why he left (主语从句) wasn't important.

What I want (主语从句) is a canvas travelling bag.

②表语从句 （从句作的是主句的表语成分）

The fact is (that) she never liked him.

That was why he spoke French so funnily.

③宾语从句 （置于动词、介词等词性后面起宾语作用的从句）

I've heard it said that you've won a scholarship.

I wonder whether you would mind doing me a favour.

④同位语从句 （表示前面一般是数量有限的、表示抽象意义的名词）

Word came that he had been abroad.

The news that our team has won the game was true.