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Discover Ludwig"been proven" is correct and can be used in written English.
You can use it to emphasize that something has been tested or shown to be true through research or experience. For example, "It has been proven that eating healthy food can help improve mental clarity."
Dictionary
Exact(59)
That's been proven forever.
"Nothing has been proven".
LITTLE has been proven.
It's been proven.
(Neither allegation has been proven).
And now it's been proven.
"That's been proven".
"That has been proven.
I have rarely been proven wrong.
But even that hasn't been proven.
Similar(1)
"This technology has been proven.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com