prove的词根词缀

prove的词根是pro，没有词缀

例句

1、

In the light of later events the decision was proved right.

从后来发生的事看，这一决定证明是正确的。

2、

Are you just doing this to prove a point?

你这么做就是为证明自己对吗

3、

The new economic policies could prove suicidal for the party.

新经济政策可能给该党带来灾难性的后果。