[1003.] (1 c.) The following verb in -ēre has the perfect stem in -v- ([869]), and the perfect participle in -itus ([910]):
| ab-oleō, destroy | ab-olēre | ab-olēvī | ab-olitus |
PERFECT STEM IN -u-.
[1004.] (2 a.) Most verbs in -ēre have the perfect stem in -u- ([874]), and the perfect participle, when used, in -tus, which is usually preceded by a short i ([910]): as,
| doceō, teach | docēre | docuī | doctus |
| habeō, have | habēre | habuī | habitus |
So also post-habeō; other compounds have i for a: as, pro-hibeō, pro-hibēre, pro-hibuī, pro-hibitus; twice contracted, prōbet, prōbeat (Lucr.). Compounds with dē and prae are regularly contracted, dēbeō, praebeō, &c.: but in Plautus once de-hibuistī, and regularly prae-hibeō, &c., throughout.
| mereō, earn | merēre | meruī | meritus |
Often deponent ([800]): mereor, merērī, meritus.
| misceō, mix | miscēre | miscuī | mixtus, mistus |
The present stem is an extension of the suffix -sco|e- ([834]); -sc- of the present runs over into the perfect.