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Allen and Greenough/ New Latin Grammar

VERBS/ Peculiarities of Conjugation

181. In tenses formed upon the Perfect Stem, v between two vowels is often lost and contraction takes place.

a. Perfects in -āvī, -ēvī, -ōvī, often contract the two vowels into ā, ē, ō, respectively: as, amāsse for amāvisse; amārim for amāverim; amāssem for amāvissem; cōnsuērat for cōnsuēverat; flēstis for flēvistis; nōsse for nōvisse. So in perfects in -vī, where the v is a part of the present stem: as, commōrat for commōverat.

Note— The first person of the perfect indicative (as, amāvī) is never contracted, the third very rarely.

b. Perfects in -īvī regularly omit v , but rarely contract the vowels except before st and ss , and very rarely in the third person perfect:—

audieram for audīveram; audīsse for audīvisse; audīstī for audīvistī; abiit for abīvit; abiērunt for abīvērunt.

Note 1—The forms sīris, sīrit, sīrītis, sīrint, for sīveris etc. (from sīverō or sīverim), are archaic.

Note 2— In many forms from the perfect stem is, iss, sis, are lost in like manner, when s would be repeated if they were retained: as, dīxtī for dīxistī (x = cs); trāxe for trāxisse; ēvāstī for ēvāsistī; vīxet for vīxisset; ērēpsēmus for ērēpsissēmus; dēcēsse for dēcessisse. These forms belong to archaic and colloquial usage.

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