Whose (cujo, cuja, cujos, cujas)

To say "whose" in Portuguese, use the relative determiner cujo.

Unlike English, cujo changes its ending to agree with the gender and number of the noun that comes immediately after it (the thing being owned)—not the owner.

MasculineFeminine
cujocuja
cujoscujas

Notice how the determiner matches the following noun in these examples:

The dog whose adoption was a success is very sweet.
O cão cuja adoção foi um sucesso é muito meigo.

In the sentence above, the dog (o cão) is masculine, but cuja is feminine singular to match adoção.

The shelter whose dogs are sick needs a veterinarian.
O abrigo cujos cães estão doentes precisa de um veterinário.

Here, the shelter (o abrigo) is singular, but cujos is plural to match cães.

No Articles After "Cujo"

Never add a definite article (o, a, os, as) right after cujo. It already does the job of the article, so "cujo o cão" is always incorrect; it must be cujo cão.

The dog whose vaccination is late is in the shelter.
O cão cuja vacinação está atrasada está no abrigo.
It is urgent to rescue the litter whose mother died.
É urgente resgatar a ninhada cuja mãe morreu.
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