| Pres. Indic. | Pres. Infin. | Perf. Part. |
|---|---|---|
| queror, complain | querī | questus |
| mīror, wonder | mīrārī | mīrātus |
| vereor, fear | verērī | veritus |
| partior, share | partīrī | partītus |
[DESIGNATION OF THE VERB.]
[736.] A verb is usually named by the present indicative active first person singular: as, regō; laudō, moneō, audiō; or by the present infinitive active: as, regere; laudāre, monēre, audīre. Deponents are named by the corresponding passive forms: as, queror; mīror, vereor, partior; or querī; mīrārī, verērī, partīrī.
[737.] For convenience, verbs with -ere in the present infinitive active are called Verbs in -ere; those with -āre, -ēre, or -īre, Verbs in -āre, -ēre, or -īre, respectively. In like manner deponents are designated as Verbs in -ī; or Verbs in -ārī, -ērī, or -īrī, respectively.
[THEME OF THE VERB.]
[738.] The several stems of the verb come from a form called the Theme. In primitives, the theme is a root; in denominatives, the theme is a noun stem.
Thus, reg- in reg-ō is a root; while vesti- in vesti-ō, dress, is a noun stem. The noun stem is sometimes modified in form. Oftentimes the noun stem is only presumed: as, audi- in audi-ō.
[739.] Some verbs have a denominative theme in the present system, and a primitive theme in the perfect system, others have the reverse.
[740.] Most verbs with an infinitive of more than two syllables in -āre, -ēre, or -īre, or, if deponent, in -ārī, -ērī, or -īrī, are denominative; most other verbs are primitive.
Thus, laudāre, monēre, audīre; mīrārī, verērī, partīrī, are denominative; while esse, dare, (dē)lēre, regere, querī, are primitive. A few verbs, however, which have the appearance of denominatives, are thought to be primitive in their origin.