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问题: be to prove 与 to be proved

I was to prove them wrong.
I proved them wrong.
请问这两句话有什么区别?
一开始我还以为第一句的意思是,他们证明了我是错的.
be to prove 与 to be proved又有什么不一样的地方?

解答:

I was to prove them wrong. 是将来过去式."我要证明他们是错的"

I proved them wrong. 是过去."我证明了他们是错的."

to prove 主动, 证明. to be proven 被动,被证明.

is to + v 是将来时.