I don't think him a man to rely on ,for he is always lying.这句不懂

问题描述:

I don't think him a man to rely on ,for he is always lying.这句不懂
为什么用him而不用he
rely on 为什么不用被动
这句句式不懂

这不是很标准的英语,标准的说法应该是
I don't think he is a man to rely on或者I don't regard him as a man to rely on
这里的rely on不必用被动语态,就像我们说I have many things to do一样,也不说many things to be done