关于of what???

例：of what they had seen 的意思就是他们看见的东西.

of 在这里就是做介词,表示...的...,

of what是引导从句的关系，算不上固定搭配

of what意思等同于:所……的，关于……的

例如：Make a list of what we have and haven't done.

列举出我们已经做到的和尚未完成的事。

of后面跟的是修饰语，比如a student of the school
如果是句子作student的修饰，就要用从句
a student of what we thought was a bad school
其实不存在of what作为固定搭配的结构，都是因为what是引导从句的关系才会出现of what

I killed the tiger of what I was taken away by police.
我杀了那只老虎所以我被警察带走了.

I am fond of what he gave me.
我喜欢他给我的东西。

of what关于
for what 因为，为了

＝why