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The phrase "sure about whether" is correct and usable in written English.
You can use it when you want to express doubt or uncertainty about something: I'm not sure about whether I should accept the job offer or not.
Exact(36)
Dr. Anderson is less sure about whether such payments will be worthwhile for home computer users.
But White is still not completely sure about whether he should play again, his friends say.
Torre did not seem as sure about whether Don Zimmer, his bench coach for five seasons, would be back.
But she's now less sure about whether being at the centre of things is the best environment for an artist.
He said he was not sure about whether he wanted to coach in baseball or what he might do next.
But many people looking through Hong Kong's end of the telescope are not so sure about whether this guarantees the territory's own way of life.
Similar(23)
What they're not so sure about is whether it was a good idea.
What I'm not sure about is whether it's going to be influential in the way the Tories want.
I was never sure about acting, whether that was what I really wanted to do; I'm still not.
And what I'm not sure about is whether the Democrats are ready for the fight they're about to face.
"I knew she was beautiful and that she could act," Mr. Favreau says, "but what I wasn't sure about was whether she could be funny.
More suggestions(2)
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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