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Discover LudwigThe phrase "never know for certain" is correct and can be used in written English.
This phrase is often used to express that one cannot be sure of something, that something is uncertain. Example sentence: "We can never know for certain what the future holds."
Exact(45)
They may never know for certain.
He said that it wasn't in his jurisdiction, so we'll never know for certain.
Probably, but I will never know for certain because I will not be doing that.
Space is big and time is long, so we may never know for certain.
We never know for certain whether Mélisande's naive-sounding utterances express innocence or manipulative knowingness.
We'll never know for certain what drew these lovers together, or how they negotiated their love through squally periods.
Similar(15)
Maybe the water was too cold, or too deep; he never knew for certain.
Though astrophysicists have seen X-ray emissions like this before, they have never known for certain what produces them.
"Screenwriting is ultimately very lonely, and at the end of a 12-hour day of writing I never knew for certain whether I'd written any good words.
That has meant that many former players who suffered late in their lives from the effects of CTE never knew for certain they had the disease.
"When the Sheriff and minister arrived at our house that day, it was approximately 3 30 p.m. I've never known for certain why it took them so long to notify me".
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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