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Discover LudwigThe phrase "know someone" is correct and usable in written English.
You can use this phrase when you are referring to someone that you are familiar with or have met before. For example, "I know someone who works at that company."
Dictionary
know someone
verb
To have personal or social connections.
Exact(59)
I know someone inside".
Want to know someone intimately?
Or do you know someone who has?
"Getting to know someone," she responds.
"Getting to know someone by writing.
Everyone will know someone who has died.
Nobody can know someone else's experiences.
"Many of us know someone involved.
I know someone who has.
"I know someone at MTV".
"I know," someone else added.
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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