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Discover Ludwig"In theory," is correct and usable in written English
You can use it when you are expressing something that is hypothetical or based on assumptions. For example, "In theory, a plant-based diet is healthier than one that includes meat."
Dictionary
In theory,
phrase
Theoretically.
Exact(60)
In theory, they can.
In theory, that is.
In theory, quite amazing.
In theory, they should.
In theory, it does.
In theory, not much.
In theory, anyway.
In theory, that is possible.
In theory, it sounds fine.
In theory this makes sense.
In theory, I shouldn't have.
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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