It proves that ...,还是it is proved that...?

看你用在什麼地方
proves 是现在事, proved 是过去是; 若要用前者, 需要明确的说出 "it" 是什麼 (例如一个实验, 一种现象等)
ex: {this experiment} proves that he is right.
It is proved that he is right.
后者感觉比较罗唆就对了

前者.It proves that=结果表明.

it proves
it proved
it is proven
it was proven

看后文的意思咯
It proves that you are wrong. 它证明你是错的
It was proved that steam is hotter than boiling water. 蒸汽比炥水要烫的事实是被证明过的

It proves that＝It is proved that"结果表明/证明."
1.It is proved that the method has a better effect.
实验表明,该方法不仅简便,而且效果良好.
2.It is proved that the algorithm is fast and reliable.
实例表明,算法运行速度快,稳定可靠.
3.It is proved that the novel roof is waterproof after improvement.改良之后的新奇房顶证明是防水的.
1 Otherwise it only proves that you are also cheating yourself!
否则只能证明你们也在自我欺骗!
2 And it proves again that there are no fans quite like the Dutch.
“橙色风暴”再次证明了没有哪个国家的球迷能和荷兰的球迷相提并论.
3 By case history calculation,it proves that this method is characterized by its simplicity solution principle and covenience in computer programming.
通过实例计算,证明该方法具有解算原理简单,便于计算机编程的特点.

it is proved that