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The phrase "has sworn" is correct and usable in written English.
In a more formal context, it can be used to express an oath or promise that someone has made, for example: "The President has sworn to protect the citizens of the country."
Exact(57)
He emphasises that he has sworn no allegiance to Russia and has no ulterior motive.
He has sworn off credit.
The SNP has sworn to end austerity.
He says he has sworn off Ambien.
He has sworn to resign if the referendum fails.
Now she has sworn there will be no more trips.
Bold, outgoing Jude has sworn off boys forever.
He has sworn to defend and protect the constitution.
He has sworn again and again to defend the 1945 constitution.
Although the couple are not involved in politics at the moment, neither has sworn it off.
"Japan has sworn an oath, never again to wage a war" he told delegates.
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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