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Discover LudwigSuggestions(5)
'previous studies have' is correct and usable in written English.
You can use it when you want to refer to studies conducted in the past. For example, "Previous studies have shown that students perform better when given adequate study time."
Exact(60)
Previous studies have shown mixed results.
Previous studies have yielded inconsistent results.
Previous studies have contradicted one another.
Previous studies have suggested that cellphone use contributes to accidents.
Previous studies have investigated this question by analysing employment data.
Previous studies have been much more narrowly focused.
Previous studies have lent support to the idea.
Previous studies have suggested some plausible mechanisms.
Previous studies have not investigated this effect.
Previous studies have shown similar results.
Previous studies have reported conflicting results.
More suggestions(15)
previous trials have
previous graduates have
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previous studies perceived
precedent studies have
previous studies described
previous studies left
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previous studies approved
previous studies achieved
previous studies ha
previous education have
erstwhile studies have
previous studies incorporated
previous studies observed
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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