Possessive adjectives (mi, tu, su)

Just like in English, you can express ownership directly using words like "my", "your", and "our".

Matching number

In Spanish, possessive adjectives must agree in number (singular or plural) with the thing being owned, not the owner. If you own multiple things, the possessive adjective becomes plural.

EnglishSingularPlural
Mymimis
Your (informal)tutus
His / Her / Their / Your (formal)susus
Ournuestro / nuestranuestros / nuestras

Notice how mi changes to mis when referring to multiple items:

My jacket is black.
Mi chaqueta es negra.
My jackets are new.
Mis chaquetas son nuevas.

The same applies to tu and su. Simply add an -s to make them plural:

Your shirt is here.
Tu camisa está aquí.
Your shirts are pretty.
Tus camisas son bonitas.
His pants are blue.
Su pantalón es azul.
Their pants are dirty.
Sus pantalones están sucios.

Matching gender for "nuestro"

While mi, tu, and su only change for number, the word for "our" (nuestro) must agree in both number and gender with the thing being owned:

Our television is expensive.
Nuestro televisor es caro.
Our backpacks are big.
Nuestras mochilas son grandes.

Let's put it all together! Here is how you mix and match different possessive adjectives in everyday conversation:

Your sister has our jackets.
Tu hermana tiene nuestras chaquetas.
His dog eats my shoes.
Su perro come mis zapatos.