This document compares and contrasts possessive adjectives in English and Spanish. It notes that in English, possessive adjectives like "my" and "your" do not change form based on the noun they modify, whereas in Spanish possessive adjectives agree in number with the noun. It also states that the Spanish possessive adjectives "nuestro" and "vuestro" agree in both gender and number with the nouns they modify. Examples of possessive adjectives used with different nouns are provided in both English and Spanish.

1. Compare and Contrast
In English possessive adjectives are invariable (they do not agree in
gender and number with the nouns they modify ).
Spanish Possessive nouns agree in number with the nouns they modify.
my cousin my cousins my aunt my aunts
mi primo mis primos mi tía mis tías
The forms nuestro and vuestro agree in BOTH gender and number with
nouns they modify.
nuestro primo nuestros primos nuestra tía nuestras tías

2. my pencil mi lápiz my pencils mis lápices
your pencil tu lápiz your pencils tus lápices
his pencil su lápiz his pencils sus lápices
her pencil su lápiz her pencils sus lápices
its pencil su lápiz its pencils sus lápices
your pencil su lápiz (usted) your pencils sus lápices
our pencil nuestro lápiz our pencils nuestros lápices
their pencil su lápiz(ellos) their pencils sus lápices

3. her house
her keys
her cat
her dogs
her bicycle
her car
her cell phone

4. his house
his car
his friends
his motorbike
his girlfriend
his dog
his laptop

5. their children
their car
their house
their mother
their father
their house
their car