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[In the perfect of the Latin first and fourth conjugations, the ‘long’ paradigm in , etc. is posterior in formation to the ‘short’ paradigm in , etc. The latter represents an old inherited Indo-European perfect paradigm; it was the normal form in Vulgar Latin, and is continued in the ‘weak’ preterites of the Romance languages.]
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G. Bonfante (1941) studied this question.
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