Possessive adjectives 2

Nuestro/vuestro agree in gender AND number — Unlike mi, tu, su which only change for number, nuestro and vuestro change for both gender and number: nuestro padre, nuestra madre, nuestros amigos, nuestras amigas. Always check both the gender and number of the noun.

Possessives with body parts and clothing — Spanish generally uses the definite article (not possessives) with body parts when the owner is clear from context: Me duele la cabeza (not mi cabeza). Similarly: Ponte el abrigo. The possessive is used for emphasis or to contrast: Mi cabeza, no la tuya.

Tuyo vs tu — which to use — Tu (no accent) is the possessive adjective: tu libro. Tú (with accent) is the subject pronoun: tú hablas. Don't confuse these. The long-form tuyo/a/os/as comes after a noun or stands alone: este libro es tuyo.