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Discover LudwigSuggestions(5)
"knew for certain" is grammatically correct and commonly used in written English.
It means to have complete and definite knowledge or understanding about something. Example: John knew for certain that he had locked the door before leaving the house.
Exact(58)
But crew members' families knew for certain.
Then I knew for certain he'd been taken".
We all knew for certain that it was the ghost".
All she knew for certain was what she didn't know.
The only thing I knew for certain was that this would not be a victimless crime.
"Whoever did this knew for certain that he would not be punished".
All I knew for certain was that I felt different from other boys: shy, serious, sensitive.
Maybe the water was too cold, or too deep; he never knew for certain.
Nobody knew for certain what was hidden beneath the ancient Sri Padmanabhaswamy temple, in Trivandrum, India.
Invested before you knew for certain that things were getting better.
And we knew for certain that it was true because you told us so.
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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