请对此句进行详细的语法解释.who to do it is what she wants to know.

问题描述:

请对此句进行详细的语法解释.who to do it is what she wants to know.

这里面有两个谓语动词:is ,wants;围绕这两个词分别构建起了两个句子,一个是主句,一个是从句.
【who to do it】 is 【what she wants to know】
主 系 表(表语从句)