Spanish Possessive Adjectives: mi, tu, su, nuestro…
Short answer
Possessives agree with the thing owned, not the owner: mi, tu and su only add -s in the plural, while nuestro and vuestro change gender too. Su is ambiguous, so de él, de ella or de usted is added when it matters.
Level A1 · pronouns, adjectives
The rule in full
| Owner | Singular thing | Plural things |
|---|---|---|
| yo | mi | mis |
| tú | tu | tus |
| él/ella/usted | su | sus |
| nosotros | nuestro / nuestra | nuestros / nuestras |
| vosotros | vuestro / vuestra | vuestros / vuestras |
| ellos/ustedes | su | sus |
They agree with the thing owned, not the owner: mis hermanos (my brothers), nuestra casa.
su is ambiguous (his / her / your / their). Clarify with de: el coche de él, la casa de ustedes.
With body parts and clothes Spanish uses the article, not the possessive: Me duele la cabeza.
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