Latin Participles
& Infinitives
Master how verbal adjectives and verbal nouns function in Latin sentences: from recognition to translation.
AP Latin
What Is a Participle?
A participle is a verbal adjective: it is formed from a verb but behaves like an adjective. It modifies a noun, agrees in case, number, and gender, and conveys tense and voice.
Verbal Side
Has tense (present, perfect, future) and voice (active, passive). Can take objects and adverbs.
Adjectival Side
Agrees with a noun in case, number, and gender. Can be used substantively ("the ones having been conquered").
What Is an Infinitive?
An infinitive is a verbal noun: it is formed from a verb but can function as a noun in a sentence. It has tense (present, perfect, future) and voice (active, passive) but no person or number.
Verbal Side
Retains tense and voice. Can take direct objects and be modified by adverbs.
Noun Side
Functions as subject, object, or complement. Used in indirect statement (accusative + infinitive).
Why Participles & Infinitives Matter
Latin authors like Vergil and Caesar use participles and infinitives constantly. Recognizing them is essential for AP Latin: they appear in nearly every sentence of the required readings.
1
Participles compress clauses. Where English uses "who was..." or "after he had...," Latin uses a single participle.
2
Infinitives build indirect statements. The accusativus cum infinitivo construction is the standard way Latin reports speech and thought.
3
Both test grammar and translation. AP Latin MCQs and FRQs frequently ask students to identify function, tense, and voice.
The Latin Participle System
The Latin Infinitive System
Participle vs. Infinitive
| Participle | Infinitive | |
|---|---|---|
| Part of Speech | Verbal adjective | Verbal noun |
| Modifies | A noun (agrees in case/number/gender) | Nothing: functions as a noun itself |
| Key Construction | Ablative Absolute | Indirect Statement (acc. + inf.) |
| Declines? | Yes: all cases, numbers, genders | No: indeclinable |
| Example | miles pugnans ("the fighting soldier") |
pugnare est... ("to fight is...") |
How Participles Function in Context
Attributive
Directly modifies a noun like any adjective: navis navigans ("the sailing ship").
Circumstantial
Describes the circumstances of the main action: Caesar profectus dixit... ("Having set out, Caesar said...").
Ablative Absolute
Noun + participle in the ablative, grammatically independent: urbe captā ("the city having been captured").
How Infinitives Function in Context
Subject
Errare humanum est. = "To err is human." The infinitive acts as the subject of est.
Complementary
Pugnare possunt. = "They are able to fight." Completes the meaning of possunt.
Indirect Statement
Dicit eum venire. = "He says that he is coming." Acc. subject + infinitive after a head verb.
Step-by-Step: Identifying the Form
1
Spot the verbal form. Look for characteristic endings: -ns/-ntis (present active participle), -tus/-ta/-tum (perfect passive participle), -re/-rī/-isse/-esse (infinitive).
2
Check agreement. If it matches a nearby noun in case, number, and gender, it is a participle. If it stands alone, it is an infinitive.
3
Determine tense and voice. Present active (-ns), perfect passive (-tus), future active (-ūrus). For infinitives: -re = present active, -isse = perfect active, etc.
4
Identify the function. Is the participle attributive, circumstantial, or in an ablative absolute? Is the infinitive a subject, complement, or part of indirect statement?
5
Translate accordingly. Choose the English rendering that best captures the relationship to the main clause.
Example 1: Circumstantial Participle
Hostēs victī ex urbe fūgērunt.
"The enemy, having been conquered, fled from the city."
Example 2: Ablative Absolute
Hīs rēbus cognitīs, Caesar exercitum dūxit.
"These things having been learned, Caesar led the army."
Example 3: Indirect Statement
Nūntius dīxit hostēs urbem cēpisse.
"The messenger said that the enemy had captured the city."
Relative Tense in Indirect Statement
In indirect statement, the infinitive's tense is relative to the main verb, not absolute. This is one of the trickiest concepts for AP Latin students.
1
Present infinitive = same time as the main verb. Dicit eum venire. = "He says that he is coming."
2
Perfect infinitive = before the main verb. Dicit eum vēnisse. = "He says that he came / has come."
3
Future infinitive = after the main verb. Dicit eum ventūrum esse. = "He says that he will come."
Common Mistakes to Avoid
✕ Confusing PPP with Passive Verb
A form like captus can be a participle ("having been captured") or part of a passive verb (captus est = "was captured"). Check for esse.
✕ Ignoring Relative Tense
Translating vēnisse as "to come" instead of "to have come." The perfect infinitive signals prior action relative to the main verb.
✕ Wrong Participle Agreement
Matching a participle to the wrong noun. Always check case, number, and gender: puellam currentem (acc. f. sg.) vs. puellae currentis (gen. f. sg.).
Summary at a Glance
| Feature | Participle | Infinitive |
|---|---|---|
| Nature | Verbal adjective | Verbal noun |
| Tenses | Present act., perfect pass., future act./pass. | Present, perfect, future (all act. + pass.) |
| Declines? | Yes (case, number, gender) | No (indeclinable) |
| Key Uses | Attributive, circumstantial, ablative absolute | Subject, complement, indirect statement |
| Tense Logic | Relative to main verb (like any adjective's timing) | Relative to main verb in indirect statement |
| AP Focus | Caesar's ablative absolutes, Vergil's epic participles | Indirect statements in both authors |
Question 1 of 5
In the sentence Milites pugnantes urbem defenderunt, what is the function of pugnantes?
Pugnantes is a present active participle (nom. masc. pl.) agreeing with milites (nom. masc. pl.). It functions as an attributive participle: "The fighting soldiers defended the city." It cannot be an ablative absolute because both words are in the nominative, not the ablative.
Question 2 of 5
What kind of construction is Caesare duce (with Caesar as leader)?
Caesare duce is an ablative absolute using a noun (Caesare) + noun/adjective (duce) in the ablative. While most ablative absolutes use a participle, this one uses a predicate noun. It is grammatically independent of the main clause: "With Caesar as leader" / "Caesar being the leader."
Question 3 of 5
In the indirect statement Scio tē hoc fēcisse, the perfect infinitive fēcisse indicates that the action of doing:
In indirect statement, the perfect infinitive signals an action that happened before the main verb. Scio tē hoc fēcisse = "I know that you did/have done this." The doing preceded the knowing.
Question 4 of 5
Which of the following is NOT a valid Latin participle form?
Latin has no perfect active participle. The form amavens does not exist. This is one of the key "gaps" in the Latin participle system. Latin only has: present active, perfect passive, future active, and future passive (gerundive).
Question 5 of 5
Latin passage (Caesar, Bellum Gallicum):
Caesar, cognitis omnibus rebus, legatos ad se convocavit. Illi, timentes periculum, tamen venerunt. Caesar dixit se pacem velle.
Translation aid: "Caesar, all matters having been learned, called the envoys to himself. They, fearing danger, nevertheless came. Caesar said that he wanted peace."
▼ Tap to read passage
In this passage, the word timentes functions as:
Timentes is a present active participle (nom. masc. pl.) agreeing with illi (nom. masc. pl., "they"). It is a circumstantial participle expressing the concessive idea "although fearing danger." It cannot be an ablative absolute because illi is nominative (and is the subject of venerunt). It takes periculum as its object, not its agreement target.