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Discover LudwigThe phrase "certain of the" is correct and can be used in written English.
This phrase expresses the idea that something is limited to, or is a subset of, a larger group or set of things. For example, "I am confident in the success of certain of the initiatives we have taken."
Exact(57)
I'm not certain of the etiquette.
No one was certain of the results".
Even aides weren't certain of the answer.
Others were less certain of the purpose of their letters.
Less certain of the right game for you?
Judge Allred said he was not certain of the answer.
He was certain of the value of his new account.
Could the official be certain of the Myanmar connection?
"That I'm pretty certain of," the president said.
He is not certain of the bar's history.
Meteorologists are still not certain of the storm's track.
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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