pоrtа, pоrtаe f. gаte Tо see the declension of porta, portae f., see Wheelock Caput II.
The present pаssive infinitive In this clаss sо fаr we have оnly encоuntered one form of the infinitive, the present active infinitive (e.g. laudāre, monēre, agere, audīre, capere). The infinitive in Latin, however, can reflect both tense and voice, which means that, by the end of this course, you will have seen present, perfect, and future infinitives, in both the active and passive voices. The formation of the present passive infinitive is straightforward, with the important exception of the 3rd conjugation: 1st conjugation: laudārī, "to be praised" 2nd conjugation: monērī, "to be warned, advised" 3rd conjugation: agī, "to be led, brought" 4th conjugation: audīrī, "to be heard" 3rd conjugation i-stem: capī, "to be taken, captured" In all but one of the conjugations, the final vowel of the present active infinitive (laudāre, monēre, audīre, etc.) is replaced with an -ī (laudārī, monērī, audīrī). In both 3rd conjugation and 3rd conjugation i-stem verbs (e.g. agere, capere), however, the present passive infinitive is formed by adding the -ī directly to the present stem: agī, capī. Note that in English the present passive infinitive follows the uniform rule for the formation of the passive, where the passive participle (praised, warned, led, heard, taken) remains unchanged, and the tense and function of the verb is carried by the auxiliary verb (present infinitive: to be), hence "to be praised", "to be warned", etc.