Subject–Verb Agreement

A finite Latin verb agrees with its subject in person and number: scrībō means “I write,” scrībis “you write,” and scrībunt “they write.” Because the ending already identifies the grammatical subject, Latin often omits a separate pronoun and can place an expressed subject before or after the verb. Agreement, not English-like word order, reveals the dependency.

Person and Number Are Built into the Verb

The three persons distinguish speaker, addressee, and everyone else. Singular refers to one grammatical subject; plural refers to more than one. The present active of amō provides the basic pattern.

The first two clauses need no ego or tū: first-person -or and second-person -s recover the subjects. In the third, plural nominative puerī and third-person plural lūdunt match.

English normally requires a pronounced subject even when the verb makes it obvious: “I am leaving,” not simply “am leaving.” Latin is a null-subject language. An explicit ego, tū, nōs, or vōs is therefore meaningful, commonly contrastive or emphatic rather than routine.

The pronouns set up a contrast. In an ordinary answer to “What are you doing?”, maneō alone would usually be enough.

The most famous compact illustration is Caesar's three-word report, preserved by Suetonius:

Each verb is first-person singular perfect, so a separate ego would add emphasis rather than necessary information.

Find the Nominative Head, Not the First Noun

Latin case endings permit flexible order. The subject is normally nominative; an accusative noun is normally an object even if it comes first.

Both clauses have nominative singular puella, accusative singular puerum, and third-person singular videt. Moving puerum to the front makes it prominent—roughly “the boy is the one the girl sees”—but does not turn it into the subject. English depends far more heavily on position, so copying English order before reading the endings produces the wrong analysis.

Modifiers inside the subject phrase do not control the verb. Find the head noun.

The head turba is nominative singular, so festīnat is singular. Genitive plural mercātōrum belongs inside the noun phrase: it says what kind of crowd, not who independently performs the finite verb. A plural translation such as “the merchants hurry” changes the grammatical structure.

Agreement Is Not Gender Agreement

Finite verbs distinguish person and number, but not masculine, feminine, or neuter. The same third-person singular form works with any singular subject.

Participles and predicate adjectives do show gender, number, and case: puella laeta est “the girl is happy,” puer laetus est “the boy is happy.” The copula est itself remains third-person singular in both. Do not search for a feminine verb ending; Latin has none.

With a perfect passive, agreement is split across two words. The participle agrees with the subject in gender, number, and case; the auxiliary agrees in person and number.

Feminine nominative plural clausae agrees with portae, and plural sunt agrees with the same subject. Together they form one finite perfect passive.

Subjects after the Verb

An expressed subject may follow its verb, especially when it introduces new information, completes a scene, or receives emphasis. The order does not cancel agreement.

Singular appāruit anticipates nominative singular nāvis. In a story, the ship is new information, so final position is natural. Latin information structure—not a fixed subject–verb–object template—helps determine order.

In a longer clause, separation still does not cancel the dependency. Singular fēmina below controls sedet even though a prepositional phrase and participial phrase intervene.

The Subject Can Be a Clause or Infinitive

Not every subject is a nominative noun. An infinitive phrase or a whole clause can occupy the subject role; Latin normally treats such a unit as grammatically singular and uses third-person singular agreement.

In the first, infinitive errāre is subject of singular est. In the second, the clause quod vēnistī is subject of singular dēlectat. English also usually treats a clause as singular (“what happened matters”), so this pattern is less foreign than null subjects.

Commands and Impersonal Verbs

An imperative has an understood second-person subject: venī! addresses one person, venīte! more than one. The number contrast remains agreement even though no nominative is spoken.

Vocative amīcī names the addressees; plural imperatives intrāte and cōnsīdite match the understood vōs. A vocative is not itself a nominative subject.

Some verbs are impersonal and conventionally remain third-person singular: pluit “it is raining,” oportet “it is proper/necessary.” English inserts dummy “it”; Latin does not hide a referential nominative pronoun behind the ending.

The first verb is impersonal singular; the second is first-person plural, with nōs explicitly stated for contrast.

A Reliable Parsing Procedure

1. Identify the finite verb and read its person and number.
2. Look for a nominative noun or pronoun with compatible number.
3. Exclude vocatives, accusative objects, and genitives embedded in a noun phrase.
4. If there is no expressed nominative, recover the subject from the ending and context.
5. Consider a clausal or infinitival subject, or an impersonal construction, before inventing a missing noun.

This method remains reliable when the subject follows the verb or is separated from it. Compound subjects and collective nouns permit additional patterns treated in Agreement with Compound Subjects and Agreement by Sense.

Common Mistakes

Copying English word order

Adding an unnecessary subject pronoun everywhere

Letting a nearby genitive control the verb

Looking for gender in a finite ending

Mistaking a vocative for the subject

Key Takeaways

• A Latin finite verb agrees with its subject in person and number, not gender.
• Endings often make subject pronouns unnecessary; explicit pronouns are frequently contrastive.
• Case and agreement identify the subject even when word order changes.
• A subject may follow its verb, be an infinitive or clause, or remain unexpressed.
• Parse the Latin dependency before arranging an English sentence.