believing the earth to be flat,many feared that 中to be flat在句中作什么成分 以及to be用法是什么?

问题描述:

believing the earth to be flat,many feared that 中to be flat在句中作什么成分 以及to be用法是什么?

动词不定式作宾补
就是believe这个词的用法结构
It is believed that he is honest.人们相信……
He is believed to be honest.
We believed him to be honest.