A collective noun (substantivo coletivo) names a group as a single unit: a cardume is a school of fish, an alcateia is a pack of wolves. Brazilian Portuguese has an unusually precise inventory of these — there is a dedicated word for fish, for bees, for bananas, for keys. English has many too (a swarm of bees, a flock of birds), but Portuguese lexicalizes more of them into single, opaque words you simply have to know. The grammatical payoff is consistent: a collective noun is grammatically singular, so it normally takes a singular verb, even though it refers to many things.
The core inventory
Learn these as vocabulary — they are common in news, nature writing, and everyday speech.
| Collective | Group of… | English equivalent |
|---|---|---|
| cardume | peixes | school of fish |
| alcateia | lobos | pack of wolves |
| matilha | cães (de caça) | pack of (hunting) dogs |
| manada | gado, búfalos, elefantes | herd of cattle/buffalo/elephants |
| rebanho | ovelhas, carneiros | flock of sheep |
| enxame | abelhas | swarm of bees |
| bando | aves, pássaros | flock of birds |
| multidão | pessoas | crowd of people |
| frota | navios, ônibus, carros | fleet of ships/buses/cars |
| cacho | bananas, uvas | bunch of bananas/grapes |
| molho | chaves | bunch of keys |
Um cardume enorme passou bem embaixo do barco.
A huge school of fish passed right under the boat.
A alcateia rondou o acampamento a noite toda.
The pack of wolves prowled around the camp all night.
Comprei um cacho de bananas e um molho de chaves novo.
I bought a bunch of bananas and a new bunch of keys.
Singular verb agreement
This is the central grammatical point. A collective noun is morphologically singular, so the verb is singular — even though the group obviously contains many members.
O cardume nada em círculos quando se sente ameaçado.
The school of fish swims in circles when it feels threatened.
A multidão gritou o nome do jogador quando ele entrou.
The crowd shouted the player's name when he came on.
O enxame atacou assim que alguém mexeu na colmeia.
The swarm attacked as soon as someone disturbed the hive.
Notice o cardume nada (not nadam), a multidão gritou (not gritaram). The unit, not its members, controls the verb. This is the prescriptively correct pattern (concordância gramatical) and the default you should follow in writing.
Why singular
The collective noun packages many entities into one grammatical object. Portuguese agreement is grammatical by default — the verb agrees with the form of the subject (singular) rather than its meaning (plural). English does the same in its prestige register (the team is winning), though British English famously allows the team are winning. Brazilian Portuguese leans more firmly toward the singular than British English does.
The notional-plural exception
There is one place where Brazilian Portuguese genuinely wavers: when the subject is a quantifying collective like a maioria de, a metade de, grande parte de, um grupo de followed by a plural noun. Here speakers often agree with the meaning (plural) instead of the form (singular). This is called concordância ideológica / atrativa (notional agreement), and both options are accepted by grammarians.
A maioria dos alunos já foi embora.
Most of the students have already left. (singular — grammatical)
A maioria dos alunos já foram embora.
Most of the students have already left. (plural — notional, very common)
Metade dos convidados ainda não chegou. / não chegaram.
Half the guests haven't arrived yet. (both accepted)
In casual speech the plural verb (foram, chegaram) is extremely common and sounds natural; in formal writing the singular is the safer choice. Note this exception applies specifically to the quantifier + de + plural noun pattern — not to lexical collectives like cardume or enxame, which keep the singular.
A note for English speakers
Two things differ from English. First, vocabulary density: English uses the generic bunch/group/flock far more than Portuguese, which reaches for a specific lexical collective. Second, the agreement default: American English strongly prefers the singular (the crowd is), so the lexical-collective rule will feel intuitive — but the a maioria foram pattern will feel wrong to an English speaker and right to a Brazilian. Don't "correct" the plural verb in a maioria dos brasileiros querem — it is idiomatic.
Common Mistakes
❌ O cardume nadam para o sul no inverno.
Incorrect — a lexical collective takes a singular verb.
✅ O cardume nada para o sul no inverno.
The school of fish swims south in the winter.
❌ A multidão estavam furiosas com o resultado.
Incorrect — singular subject needs a singular verb and adjective.
✅ A multidão estava furiosa com o resultado.
The crowd was furious about the result.
❌ Comprei um grupo de bananas.
Incorrect — for bananas the collective is 'cacho', not 'grupo'.
✅ Comprei um cacho de bananas.
I bought a bunch of bananas.
❌ Perdi meu grupo de chaves.
Incorrect — the collective for keys is 'molho'.
✅ Perdi meu molho de chaves.
I lost my bunch of keys.
❌ A maioria dos alunos foi embora e eles ficaram bravo.
Incorrect — broken number agreement in the follow-up.
✅ A maioria dos alunos foi (ou foram) embora; ficaram bravos.
Most of the students left; they were annoyed.
Key Takeaways
- Brazilian Portuguese has a precise, opaque set of collectives: cardume (fish), alcateia (wolves), enxame (bees), cacho (bananas/grapes), molho (keys). Learn them as vocabulary.
- A lexical collective is grammatically singular and takes a singular verb: o cardume passa, a multidão gritou.
- With a quantifier + de + plural noun (a maioria dos alunos), both singular (formal) and plural (notional) agreement are accepted; plural is very common in speech.
- Don't import English's generic group/bunch where Portuguese has a specific word.
Now practice Portuguese
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- Nouns: OverviewA1 — How Brazilian Portuguese nouns work — every noun has grammatical gender (masculine or feminine), inflects for number, and controls agreement across its whole phrase, even though there is no case system.
- Quantifiers: Muito, Pouco, BastanteA1 — How Brazilian Portuguese quantifying determiners (muito, pouco, tanto, quanto, bastante, mais, menos, vários) agree — and why the very same word inflects before a noun but freezes before an adjective or verb.
- Plural Formation: Regular RulesA1 — The default Brazilian plural — add -s to vowel-ending nouns — and the agreement chain it sets off, forcing every article, possessive, and adjective in the noun phrase to pluralize too.