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The correct form of this is "have previously been." You can use this form of the verb when talking about something that has happened in the past. For example, "Many of my coworkers have previously been to the restaurant."
Exact(1)
On inspection, the usable portion of the empirical distributions seemed to be well fit by gamma distributions, which have previously be used to model axon length distributions [38].
Similar(59)
Limiting cases have previously been considered.
Only 39/157 patients have previously been clinically described.
A number of suggestions have previously been advanced.
There have previously been similar tensions on Corsica.
All three have previously been defense counsels in tribunal cases.
All the other tracks have previously been released.
Other individuals have previously been wrongly outed as Nakamoto.
These links have previously been reported by the Guardian.
No comparable figures have previously been collated.
Both pathways have previously been linked to childhood medulloblastoma.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com