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In page Vulgar Latin:

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Apart from the grammatical and phonetic developments there were many cases of verbs merging as complex subtleties in Latin were reduced to simplified verbs in Romance. A classic example of this are the verbs expressing the concept "to go". Consider three particular verbs in Classical Latin expressing concepts of "going": ire, vadere, and *ambitare.[citation needed] In Spanish and Portuguese ire and vadere merged into the verb ir, which derives some conjugated forms from ire and some from vadere. andar was maintained as a separate verb derived from ambitare.