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In page Vulgar Latin:

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The semantic shift that underlies this evolution is more or less as follows: A speaker of Classical Latin might have said: vir est in foro, meaning "the man is in/at the marketplace". The same sentence in Vulgar Latin could have been *(h)omo stat in foro,[citation needed] "the man stands in/at the marketplace", replacing the est (from esse) with stat (from stare), because "standing" was what was perceived as what the man was actually doing.