i have no idea what to say to John

问题描述:

i have no idea what to say to John
与i have no idea of what you are asking me to do有什么不同,这里的of是什么作用,有什么不同吗?

of相当于about,关于,可以省略,what to say to John
和what you are asking me to do做句子的补语,两个句子的结构相同.