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The phrase "warns them to" is correct and usable in written English.
It can be used when indicating that someone is advising or cautioning others about a potential danger or issue. Example: "The teacher warns them to pay attention during the lecture to avoid missing important information."
Exact(23)
He warns them to be vigilant.
The letter warns them to stop or face possible legal action.
She also warns them to be prepared for shotguns leaning against kitchen walls.
As soon as we see guards stopping three Toyotas with gasoline in the back, he calls several friends and warns them to keep watch.
Each time drivers turn it on, it warns them to keep their hands on the wheel and be prepared to take over.
Tory central office is busy pumping out "52 weeks of weak leadership" – but one wise Telegraph commentator warns them to study him more carefully.
Similar(36)
A bookkeeper on the eighth floor phoned management on the tenth floor to warn them to evacuate, but the floor workers had no such warning.
I warned them to watch out.
She warned them to be quiet.
"We warn them to be careful.
Will you warn them to avoid him?
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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