Perfect Active Infinitive

The perfect active infinitive presents its subject as the performer of an action already completed before the time of a governing verb: vēnisse “to have come,” scrīpsisse “to have written.” It is especially common in indirect statement, where English may translate it with “had,” “has,” or a simple past. The stable Latin meaning is not any one English tense but active voice plus anterior relative time.

All unlabelled uses below are normal Classical prose. Teaching forms carry pedagogical macrons; the one source quotation preserves its conventional unmacronized text.

Formation from the Perfect Stem

Remove -ī from the first-person singular perfect active—the third principal part—and add -isse. This is a perfect-system form, so the present infinitive is not a safe starting point.

The form is one word and never agrees for gender or number. Perfect stems, however, are often unpredictable: agō gives ēgisse, ferō gives tulisse, sum gives fuisse, and possum gives potuisse. There is no honest shortcut here: learn the third principal part with every verb.

Contracted forms such as amāsse for amāvisse and audīsse for audīvisse occur, particularly in verse and elevated prose (literary). They are genuine perfect infinitives, not new endings. Beginners should produce the full forms while learning to recognize contraction.

Relative Time: Earlier Than the Governing Verb

The infinitive’s “perfect” is relative. With a present reporting verb it normally corresponds to an English perfect or past; with a past reporting verb it commonly corresponds to an English pluperfect.

Nothing inside scrīpsisse changes. The event of writing precedes dīcit in the first sentence and dīxit in the second. English chooses different tense forms because it locates both events on an absolute timeline; Latin explicitly packages the writing as anterior to its local governing verb.

The minimal contrast with a present infinitive makes the system visible:

The change from dormīre to dormīvisse changes relative chronology, not the person performing the action. For a future event Latin instead uses the future active infinitive described on Future Active Infinitive.

Its Subject in Indirect Statement

An expressed subject of an infinitive in indirect statement is accusative. If that subject refers back to the subject of the reporting verb, Classical Latin normally uses reflexive sē. The case pattern is treated fully under Accusative Subject of the Infinitive.

In the first sentence, sē refers to Julia; in the second, eum points to a different male participant. The infinitive remains indeclinable, so the pronoun and context establish its subject. An accusative noun beside the infinitive may instead be its object: in dīcit servum dominum vīdisse, word order alone cannot decide which accusative saw the other. Context normally resolves such genuine ambiguity.

The following sentence is from Caesar, Bellum Gallicum 1.12; its spelling is reproduced without pedagogical macrons:

Here Helvetios is the accusative subject of traduxisse, while tres ... partes copiarum is its object. Parsing the clause roles before translating prevents a plausible but reversed reading.

Voice and Clause-Level Syntax

“Active” means that the infinitive’s subject performs the verbal action. Compare active hostēs pontem rūpisse “that the enemies had broken the bridge” with passive pontem ā hostibus ruptum esse “that the bridge had been broken by the enemies.” Both are anterior; voice reverses the syntactic perspective.

The perfect infinitive can carry everything a finite verb can govern: a direct object (pontem), indirect object, predicate, adverb, or prepositional phrase. What it cannot carry is finite person marking. The larger construction supplies the subject.

Some deponent verbs have perfect forms that look passive but mean active: profectum esse “to have set out,” locūtum esse “to have spoken.” Those are not perfect active-form infinitives in -isse; they require participial agreement and belong morphologically with the construction explained on Perfect Passive Infinitive, despite their active lexical meaning.

Beyond Neutral Indirect Statement

A perfect active infinitive can occur wherever a construction licenses an infinitive and anteriority matters, but indirect statement is overwhelmingly its clearest productive home. Poets sometimes use a perfect infinitive where ordinary prose expects a present complementary infinitive (literary), often for metrical or aspectual effect. That license should be recognized in reading, not generalized into beginner prose.

Remember also that English “to have done” can express unreal or counterfactual meaning (“I would like to have gone”). Latin does not obtain that meaning from -isse alone. The governing verb, mood, and context must build the modality; the infinitive itself supplies active voice and anteriority.

Common Mistakes

Translating -isse as an English present infinitive

Building the form from the present stem

Giving the infinitive a nominative subject

Confusing active and passive anteriority

Key Takeaways

• Form the perfect active infinitive from the perfect stem plus -isse; irregular perfect stems must be learned.
• It is indeclinable and active: its subject performs the action.
• It marks time anterior to its governing verb, so its English tense changes with context.
• In indirect statement, identify the accusative subject before assigning objects or translating.