Relative Cujo (Whose) | Portuguese (Brazil) Grammar

English has a single, simple word for the relative possessive: whose. The man whose house burned down. Portuguese has cujo, and it behaves in three ways that constantly trip up English speakers: it agrees with the thing that is possessed (not the owner), it never takes an article, and it lives almost entirely in formal and written register. This page is about the clause structure that cujo builds. For the bare forms and the colloquial alternatives, see the companion pronoun page on cujo.

The core idea: cujo links two nouns

A cujo clause joins two noun phrases by saying that the second belongs to the first. Take two facts:

O homem é meu vizinho. + A casa do homem queimou.

To fuse them, you replace do homem with cujo and pull the possessed noun (casa) right behind it:

O homem cuja casa queimou é meu vizinho.

The man whose house burned down is my neighbor.

The owner is o homem. The possessed thing is a casa. The crucial fact — and the single most common error — is that cujo agrees with the possessed noun, not with the owner. Casa is feminine singular, so we use cuja. The gender of o homem is irrelevant.

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Think of cujo as meaning "the X belonging to which" — and it agrees with X, the thing owned. Mentally rephrase "the man whose house" as "the man, the house of whom" and let house drive the agreement.

The four forms

Cujo is the only relative pronoun in Portuguese that inflects for both gender and number, exactly like an adjective. It matches the noun that immediately follows it.

Form	Agrees with	Example	Translation
cujo	masc. sing.	o autor cujo livro ganhou	the author whose book won
cuja	fem. sing.	a autora cuja obra admiro	the author whose work I admire
cujos	masc. pl.	o aluno cujos pais vieram	the student whose parents came
cujas	fem. pl.	a empresa cujas ações caíram	the company whose shares fell

A escritora cujos romances eu devorei na adolescência morreu ontem.

The writer whose novels I devoured as a teenager died yesterday.

Here the owner is a escritora (feminine), but the possessed noun is romances (masculine plural), so the form is cujos. The owner's gender never enters the calculation.

Rule that English speakers always break: no article after cujo

In English you say "whose the house"? No — you just say "whose house." Portuguese is the same in principle, but learners coming from a "the X of the man" mental model want to insert an article. Cujo already contains the determiner. Putting an article after it is ungrammatical.

Conheço a professora cujo método transformou a escola.

I know the teacher whose method transformed the school.

É um país cujas fronteiras nunca foram bem definidas.

It's a country whose borders were never clearly defined.

Never cujo o método or cujas as fronteiras. The sequence cujo + noun is glued together with nothing between them.

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Memorize the rule as a slogan: "cujo eats the article." If you feel the urge to put o, a, os, or as after cujo, that urge is a transfer error from how you'd phrase possession with de — delete the article.

Preposition + cujo

Because cujo introduces a noun, that noun can itself be governed by a preposition inside the relative clause. The preposition then sits in front of cujo, never stranded at the end the way English allows.

Build it from two sentences:

Trabalho no prédio da empresa. + A empresa fica no centro.

A empresa em cujo prédio eu trabalho fica no centro.

The company in whose building I work is downtown.

English speakers are tempted to say "the company whose building I work in," stranding in at the end. Portuguese forbids this: the preposition climbs to the front, giving em cujo prédio.

Foi um escândalo para cujas consequências ninguém estava preparado.

It was a scandal for whose consequences no one was prepared.

O cientista de cujas teorias todos falavam recusou a entrevista.

The scientist whose theories everyone was talking about refused the interview.

In the last example, the verb is falar de (to talk about), so the preposition de leads: de cujas teorias. The agreement still tracks the possessed noun (teorias, feminine plural).

Register: cujo is formal — and BR speech avoids it

Here is the honest truth that many textbooks hide: in everyday spoken Brazilian Portuguese, almost nobody uses cujo. It is correct, elegant, and expected in journalism, contracts, essays, and careful writing — but in conversation it sounds bookish. Brazilians replace it with a far looser structure: a plain que plus a possessive dele/dela (literally "that ... his/her").

Formal / written (with cujo)	Colloquial spoken BR
o cara cuja casa queimou	o cara que a casa dele queimou
a moça cujo pai eu conheço	a moça que eu conheço o pai dela
o time cujos jogadores se machucaram	o time que os jogadores dele se machucaram

O cara que a casa dele queimou é meu vizinho.

The guy whose house burned down is my neighbor. (colloquial)

A escritora que eu adorava os livros dela morreu ontem.

The writer whose books I loved died yesterday. (colloquial)

This colloquial pattern uses an invariable que and lets the possessive pronoun dele/dela/deles/delas carry the relationship — which, conveniently, agrees with the owner, the opposite of cujo. Compare: with cujo you track the possessed thing; with dele you track the possessor. Brazilians find the dele strategy easier precisely because it splits the relative link (que) from the possession (dele), so nothing has to agree across the gap.

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Use cujo when you write and when register matters — a job application, an article, an exam essay. Recognize the que ... dele/dela version when you listen, because that is what you will actually hear on the street and in WhatsApp messages.

Cujo refers to things, not just people

English "whose" feels person-bound, but cujo applies freely to objects, places, institutions, and abstractions. This is one reason it thrives in formal prose, where you describe systems and entities.

Visitamos uma cidade cujas ruas pareciam saídas de outro século.

We visited a city whose streets seemed to come from another century.

Aprovaram uma lei cujos efeitos só veremos daqui a anos.

They passed a law whose effects we'll only see years from now.

Common mistakes

❌ O homem cujo a casa queimou...

Incorrect — never put an article after cujo.

✅ O homem cuja casa queimou...

The man whose house burned down... (cujo eats the article; it also agrees with casa)

❌ A escritora cuja livros são famosos...

Incorrect — cujo agrees with the possessed noun (livros, masc. pl.), not the owner.

✅ A escritora cujos livros são famosos...

The writer whose books are famous...

❌ A empresa cujo prédio eu trabalho...

Incorrect — the verb trabalhar needs em; the preposition must precede cujo.

✅ A empresa em cujo prédio eu trabalho...

The company in whose building I work...

❌ Esse é o aluno que sua mãe ligou.

Incorrect — using que + seu to mean 'whose' is ambiguous and not standard.

✅ Esse é o aluno cuja mãe ligou. / (colloquial) Esse é o aluno que a mãe dele ligou.

That's the student whose mother called.

The fourth error is subtle: Brazilians do not fix the colloquial gap with seu/sua (which is ambiguous — it can mean "your"), but with dele/dela, which is unmistakable. So the spoken repair is que a mãe dele ligou, never que sua mãe ligou.

Key takeaways

Cujo agrees with the possessed noun, not the owner: a escritora cujos livros.
It takes no article: cujo método, never cujo o método.
A governing preposition precedes cujo: em cujo prédio, de cujas teorias.
It is formal/written. Spoken BR uses que ... dele/dela: o cara que a casa dele queimou.
It refers to people and things alike: uma lei cujos efeitos....

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