Synopsis of Latin Infinitives and How to Produce Them

(Cf. Wheelock 25)

To Latin Teaching Materials Home

LatinPraxis Index


Remember: Latin infinitives occur in only three tenses (present, perfect, future) and two voices (active and passive), for a total of six infinitive forms.


How to Produce the Infinitive Forms in Latin


1. The present active infinitive (e.g. to love) and the present passive infinitive (to be loved) derive from the second principal part:








Present Active Infinitive:
Present Passive Infinitive:




Note: Conjugations III and III-io drop the -er- in the passive infinitive present: dûcî / capî


2. The perfect active infinitive (to have loved) derives from the third, and the perfect passive infinitive (to have been loved) derives from the fourth principal part:







Perfect Active / Passive Infinitive:


amâtus esse



3. The future active infinitive (to be about to love) and the future passive infinitive (to be about to be loved) derive from the fourth principal part:









Future Active Infinitive:
Future Passive Infinitive:

amâtûrus esse
amâtum îrî



Synopsis of Regular Infinitive Forms in Latin


active / passive

active / passive

active / passive

Use 2d principal part

Active: use 3d part; passive: 4th

Use 4th part

I: amâre / amârî
to love / to be loved

amâvisse / amâtus esse
to have loved / to have been loved

amâtûrus esse / amâtum îrî
to be about to love / to be about to be loved

II: monêre / monêrî
to warn / to be warned

monuisse / monitus esse
to have warned / to have been warned

monitûrus esse / monitum îrî
to be about to warn / to be about to be warned

III: dûcere / dûcî
to lead / to be led

dûxisse / ductus esse
to have led / to have been led

ductûrus esse / ductum îrî
to be about to lead / to be about to be led

III-io: capere / capî
to take / to be taken

cêpisse / captus esse
to have taken / to have been taken

captûrus esse / captum îrî
to be about to take / to be about to be taken

IV: audîre / audîrî
to hear / to be heard

audîvisse / audîtus esse
to have heard / to have been heard

audîtûrus esse / audîtum îrî
to be about to hear / to be about to be heard


Go to the practice.


For the use of these forms, see the page on Accusative-with-Infinitive Constructions.





navigation bar latin teaching materials classics programs current course offerings faculty Latin, Greek, and Classical Humanities at SLU




Latin Teaching Materials at Saint Louis University: © Claude Pavur 1997 - 2009.  This material is being made freely available for non-commercial educational use.