Adjectives in Spanish must agree in gender
and number with the noun that it is describing.
• If the noun is singular, the adjective must be singular.
• If the noun is plural, the adjective must be plural.
To make a noun or adjective plural:
If the noun/adjective ends in a vowel, add -s
example: bonita bonitas
la chica bonita las chicas bonitas
If the noun/adjective ends in a consonant add es.
example: fácil fáciles
el examen fácil los exámenes fáciles
But…
If the noun/adjective ends in z.
Change the z to c and then add es
example:
el lápiz grande los lápices grandes