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Discover LudwigThe phrase 'to whether' is not correct and should not be used in written English.
'Whether' should be used in its place; as in the example sentence - 'I have yet to decide whether I will attend'.
Dictionary
to whether
pronoun
Which of two.
Exact(60)
Admittedly, evidence is often irrelevant to whether people believe something.
I was suspicious as to whether it would continue".
"It's not a question as to whether they were marginal.
Identical principles apply to whether a suspect should stand trial.
"This is key to whether he remains president".
As to whether there's Arcangel clickbait on theguardian.com?
"As to whether I am a pawn, well, maybe.
He demurs as to whether this is good or bad.
In fact I'm sceptical as to whether it will be".
Questions arose as to whether they'd made it all up.
As to whether there'll be more, nothing's confirmed yet.
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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