Question

I found those books to be very interesting 这句话是什么结构，为什么这样

Answer 1

I found those books to be very interesting

这句话的结构是动词find 的用法之一：
find + 宾语 + 宾补（可以是adj., 也可以是 to be adj, 或者n等）
I found it hard to learn a foreign language. (这里it 是形式宾语）
I found the book a great work.

此句中：
I 主语
found谓语
those books 宾语
to be very interesting 动词不定式作宾补

满意就立即采纳吧~~

-----------------------------------
如有疑问欢迎追问！
满意请点击右上方【选为满意回答】按钮