The phrase "always prove that" is correct and usable in written English.
It can be used when discussing the necessity of demonstrating or validating a particular point or claim consistently.
Example: "In scientific research, it is essential to always prove that your hypothesis is supported by the data collected."
Alternatives: "consistently demonstrate that" or "always validate that".
Since the computation of this "counterfactual" is done with a model that assumes that the policy works as advertised, the calculations always "prove" that the policy was effective.
School parent meetings always prove that the saying "There are no dumb questions" is completely false.
God doesn't command Christians to always prove that they are right, but He does command them to always show love to others.
Of course, classical genetics found the major players - lethal mutations always prove that something is essential - but the small number of major players do not explain the endless variety of intermediate types and just slightly more somatically and reproductively fit individuals under specific conditions.
Fortunately, they will also charm the many who understand what history has always proved: that places and buildings cannot always move forward in predictable ways.
He's always proved that what he does best is score and I'm sure he will do everything to be anxiety free to score".
"I admire Victor Matfield greatly," said Kay. "He is a tough competitor, but after a match he always proves that he is a great guy.
And in America, wanting love and happiness, having dreams, always proves that whoever "they" are, they are a lot like "us".
Sigourney Weaver, as will-driven as always, proves that at the age of fifty-one she can play a femme fatale, but not that she can do it with delight.
Gray proves — as he has always proved — that what matters isn't frames and cuts, story lines and character traits, but the melodies and harmonies, the moods and tones that arise from them, and that, in turn, seem to deflect, distort, shudder, and shatter them.
"If we do that consistently we've always proven that you win in the end".
