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Discover LudwigSuggestions(5)
"who used" is a correct and usable phrase in written English.
It is typically used to refer to a person or group of people who have a history of doing something in the past. It can also be used to introduce a relative clause. Example: "The researchers studied a group of individuals who used to smoke but have now quit."
Exact(60)
Who used the data?
WHO used to handle all American launches?
agent who used the name Robert Gonzalez.
"The woman who used to live here.
You know who used to like it?
Who used an app?
Taylor and Harold C. Urey, who used a zeolite.
Mix's stepfather, who used to hit him?
People who used to watch comedy?
Good for Enfield, who used the F.G.C.U.
So who used the veto most often?
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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