His theory proved to be right.

问题描述:

His theory proved to be right.
为什么不是His theory was proved to be right.?
应该用被动啊?

prove可以做及物动词"证明",有被动语态.比如:You should prove your theory.
也可以做不及物动词"证明是",没有被动结构.His theory proved to be right.就是prove做不及物动词的用法.