I have problems of my own (that / which) you know nothing of.

老师，这句话里面的结构成分我搞不来。为什么句子末尾要用of?(that/which)为什么放在own后?

     【答】nothing of 的意思是“一点也不”。 (that / which) you know nothing of 是定语从句， problems 是定语从句的先行词； of my own 是 problems 的定语。