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Discover LudwigThe phrase "not been established" is grammatically correct and can be used in written English.
It is often used to indicate that something has not yet been determined or proven. Example: The effectiveness of the new medication has not been established through rigorous testing.
Exact(60)
"That has not been established".
That's not been established.
Democracy has not been established in Russia.
Hypothetical infringement has not been established.
International ages (subdivisions) have not been established.
That has not been established" (p. 76).
That had not been established before".
But that motive has not been established.
But this has not been established.
But conclusive proof of this phenomenon has not been established.
A ceremonial link to Africa has not been established.
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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