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The sentence "He was so persistent" is correct and usable in written English.
You can use it whenever you are trying to describe someone who is stubborn and determined. For example, "No matter how many times she told him no, he was so persistent that she eventually had to give in."
Exact(3)
But he was so persistent.
"I'm so grateful that he was so persistent because I would have written him off," Ms. Crisci said.
He was so persistent in this advice that we eventually called a tree service, which vindicated my wife's judgment that the tree was just fine.
Similar(57)
Metcalfe encouraged them to work out why she was so persistent.
He is so persistent, so seemingly deaf to the politics of the moment, that he even interrupts Rumsfeld to push his point.
He is instructed in Taoism, but he is so persistent in his queries about creation that he is told, "You must go to Wei, my boy... or wherever Confucius happens to be for the moment". His meeting with Confucius is a success and, perhaps not surprisingly, the portrait of Confucius, a happy blend of diplomat, nobleman and mystic, is the subtlest and most satisfying in the novel.
The man's condition was so persistent he avoided watching television, listening to the radio and reading newspapers because he felt he had "encountered it all before".
"I was so persistent," Mr. Hellman recalled.
Perhaps it was because the damage that was done was so persistent.
She was so persistent about it that it started to pray on their minds.
And no other party leader was so persistent in the face of such frequent defeat.
More suggestions(3)
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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