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Discover LudwigFor the most part, "known before" is not a grammatically correct phrase.
It is likely that the intended meaning is "previously known." An example of this in a sentence could be: "The results of this study confirm what was previously known about the effects of exercise on mental health."
Exact(59)
Unprecedented means "never done or known before".
-Was this information known before?
Nothing like it had been known before.
A mood I have never known before.
"I let myself be known before I understood myself.
Even the baby's gender is usually known before it arrives.
Many of the signatories have made their doubts known before.
The outcome is unlikely to be known before July.
These proteins were known before gene splicing was developed.
("I'd never known before what real peace is," he said).
That's the only time I've known, before now.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com