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In page Vulgar Latin:

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Contrary to the millennia-long continuity of much of the active verb system, which has now survived 6000 years of known evolution,[citation needed] the synthetic passive voice was utterly lost in Romance, being replaced with periphrastic verb forms—composed of the verb "to be" plus a passive participle—or impersonal reflexive forms—composed of a verb and a passivizing pronoun.