Predicate Nominatives

A predicate nominative is a nominative noun or noun phrase that identifies, classifies, or renames a nominative subject through a linking predicate: “Lucia is a teacher,” “Marcus became consul,” “Who is that?—My brother.” The two nominatives do different jobs. One is the subject about which the clause speaks; the other completes the predicate by saying what that subject is.

English keeps the same noun form in “Marcus is consul” and “they elected Marcus consul.” Latin does not. A predicate noun matches the case relation required by its construction: nominative beside a nominative subject, but accusative beside an accusative object or the accusative subject of an infinitive. That case matching—not position and not an implied English “as”—is the central principle.

Identification and classification with sum

The commonest linking verb is sum, esse “be.” A predicate nominative can identify an individual, place someone in a class, state an office or occupation, or equate two descriptions.

Both Lūcia and magistra are nominative singular. Lūcia supplies the person already under discussion; magistra classifies her by occupation. Latin normally omits an article because it has no equivalent of English “a” or “the.”

The answer naturally omits an explicit subject pronoun. Nominative frāter meus is the predicate complement of the understood “he.” Its placement before est is ordinary and does not make it a different construction.

Neuter odium and feminine causa do not agree in gender. A predicate noun has its own lexical gender; nominative case links it to the subject syntactically. This differs from a predicate adjective, which does agree with the subject in case, number, and gender: bellum longum est “the war is long.”

Case matching is not full agreement

Predicate nouns can differ from their subjects in gender and sometimes in number. The finite verb regularly agrees with the grammatical subject, though Classical Latin sometimes shows attraction to a predicate noun of a different number.

Here formally plural Athēnae controls plural erant, while predicate domicilium is neuter singular because one “home” classifies the city. Agreement with the subject is therefore the first analysis to test, but it is not an infallible diagnostic: authors can instead attract the copula to the number of a predicate noun.

Feminine aedēs and neuter templum share nominative singular case but not gender. The demonstrative haec agrees with subject aedēs; genitive Iūnōnis depends on templum. Agreement shows which words form each noun phrase.

English sometimes recommends “It is I” in very formal style but usually says “It's me” in conversation. Classical Latin does not reproduce that colloquial English object form after sum: the identifying pronoun remains nominative.

Nominative ego is normal Latin even though idiomatic informal English uses “me.” The contrast is structural, not a difference in politeness.

Other linking and result predicates

Predicate nominatives also occur with verbs meaning “become,” “seem,” “remain,” or in passive constructions meaning “be made, elected, considered, named.” These predicates do more than connect two static labels: they present an acquired status, an appearance, or a result.

Lūcius is nominative subject and medicus the resulting identity. Factus est literally has the shape “was made” but here functions as the perfect of fīō, “became.” English “into a doctor” must not prompt a Latin preposition.

Nominative amīcus is predicated of nominative ille; dative mihi marks the person to whom the impression occurs. The English infinitive “to be” is supplied idiomatically and does not imply that Latin contains an infinitive here.

In this (formal, political) use, passive creātus est keeps the person elected as nominative subject and the office cōnsul as predicate nominative. Latin does not need ut for English “as consul.”

Subject haec urbs and name Rōma are both nominative with passive appellātur. The fuller patterns for names and metalinguistic citation appear on Nominative in Naming and Citation.

The active and infinitive contrasts

Case follows the local syntax. Compare passive Mārcus cōnsul creātus est with its active counterpart:

Accusative Lūcium is the direct object and accusative cōnsulem is its object complement. Calling cōnsulem a predicate nominative would confuse a function—predication—with one particular case form. It is a predicate accusative here.

Indirect statement produces the same case shift because an expressed subject of the infinitive is accusative.

Within the infinitive clause, Mārcum and bonum cōnsulem are accusative. The matrix subject omnēs remains nominative with finite sciunt. The visible verb form tells you which clause licenses which case.

Predicate nominative or apposition?

An appositive renames a noun directly; a predicate nominative completes a linking assertion. Punctuation in modern editions can help, but structure is decisive.

Medicus meus is appositive: it expands Mārcus inside the noun phrase. In Mārcus medicus est, “Marcus is a doctor,” medicus belongs to the predicate and states the point of the clause. Both happen to be nominative because apposition also matches the noun it renames in case, but their syntactic functions differ.

Latin can omit sum in compressed (literary), proverbial, genealogical, or label-like language. A verbless sequence must be interpreted from discourse; do not declare every adjacent pair of nominatives a complete predicate. At A1, explicit sum is the safest production choice unless imitating a known idiom.

Parsing and production diagnostics

When you meet two nominatives, first find the finite predicate. If it is a form of sum or another linking/result verb, ask which noun phrase is already the discourse topic and which identifies or classifies it. Use demonstrative agreement, verb agreement, and context; position alone is not decisive. When composing, select the subject's case from its clause, then put the identifying complement in the same case. Do not translate English “as,” “into,” or “to be” word for word before the Latin construction is chosen.

Common Mistakes

1. Making the predicate noun agree in gender like an adjective

2. Adding ut for English “as” after election

3. Leaving an active object complement nominative

4. Keeping nominatives inside an accusative-and-infinitive clause

Key Takeaways

A predicate nominative identifies, classifies, names, or gives a resulting status to a nominative subject. It shares case with that subject but retains its own lexical gender and sometimes its own number. Change the local construction—active object complement or accusative-and-infinitive—and the predicate noun changes to accusative as well.