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Discover LudwigThe phrase "By who" is not correct in standard written English
It is typically used incorrectly when asking about the agent of an action; the correct form is "By whom." Example: "The report was written by whom?"
Exact(60)
"By who?" the operator asked.
By who? the husband asks.
By WHO standard, this is anaemia.
My response is by who?
Threatened by who?
If so, by who?
"Kidnapped by who?" "Whom".
"Classified by who?
Alleged by who? Americans, mostly.
"Got held by who? Hillary.
Vitamin A supplementation is recommended by WHO in emergency situations.
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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