how to use "prove"

[Sandsoppa]

Dear all,

I am not for sure how to use "prove" in a sentence:

"If this theory is proved to be true, ......"

or

"If this theory proves to be true,..."

What if the subject is changed to a person?

What is the difference between "He is proved to be right" or "He proves to be right."

Thanks

Sand

[Mister Micawber]

It works either way; many verbs function similarly, passively and actively.
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Native English teacher at Mister Micawber's