Possessive adjectives in Spanish help us show who owns something. They change based on whether the noun is male or female, and if it’s one item or more. Let's break it down into simple parts:

Singular Possessive Adjectives:

• mi (my)
• tu (your - informal)
• su (his, hers, its, your - formal)

Plural Possessive Adjectives:

• nuestro/a (our - masculine/feminine)
• vuestro/a (your - plural informal - masculine/feminine)
• su (their, your plural formal)

Examples in Sentences:

• Mi libro es interesante.
  (My book is interesting.)

• Tu casa es grande.
  (Your house is big.)

• Su perro es amable.
  (His/Her dog is friendly.)

• Nuestra familia es unida.
  (Our family is close.)

• Vuestra decisión es importante.
  (Your decision is important - when talking to a group.)

• Sus amigos son divertidos.
  (Their/Your friends are fun.)

Agreement Rules:

These adjectives need to match the noun they describe:

• nuestro (masculine singular) changes to nuestra (feminine singular).
• nuestros (masculine plural) changes to nuestras (feminine plural).

Basic Structure:

In Spanish, sentences usually follow this order: Subject-Verb-Object. Here’s how you use a possessive adjective:

• Subject: Yo
• Verb: tengo (have)
• Possessive Adjective: mi
• Object: gato (cat)

So, you can say: Yo tengo mi gato.
(I have my cat.)

Knowing these possessive adjectives is important. They help us express ownership in Spanish easily and correctly.