This is what I've always wanted to talk to you.这是我一直想对你说的.（厕所中看到的一句标语）我是这么理解句子结构的：1、缩合关系代词What引导宾语从句,展开后是：this is all that I've always wanted to t

This is what I've always wanted to talk to you.
这是我一直想对你说的.（厕所中看到的一句标语）
我是这么理解句子结构的：
1、缩合关系代词What引导宾语从句,展开后是：
this is all that I've always wanted to talk to you
2、that引导同位语从句对ALL内容的补充?还是that引导定语从句,在从句中作什么的宾语?

This is what I've always wanted to talk to you.
1.句子不正确的.
what是表语从句引导词,在从句中充当成分的.而talk是个不及物动词,应该说
This is what I've always wanted to tell you.（what作tell的直接宾语.）
2.that引导的是定语从句,引导词在定语从句中充当宾语.(tell的直接宾语）
This is all that I always wanted to tell you.
3.同位语从句是说明前面的名词内容的,不是修饰的.
The news that he will come back is true.(that-从句说明news的内容,that不充当成分的）