1. Adjective Agreement

2. Adjective Agreement (Sing.)
To describe one person or thing, use ES + a singular adjective.
Ejemplo:
El libro es divertido.
(The book is fun.)
La clase es divertida.
(The class is fun.)

3. Adjective Agreement (Plural)
To describe more than one person or thing, use
SON + a plural adjective.
Ejemplo:
Los libros son buenos.
(The books are good.)
Las clases son buenas.
(The classes are good.)

4. Adjective Agreement (Mixed Genders)
If you’re describing a group of males and females, use a masculine plural adjective.
Ejemplo:
Mis compañeros son simpáticos.
(My classmates are nice.)

5. Adjective Agreement (Consonants)
Adjectives ending in –e or a consonant as l, r, or n have two forms: singular and plural.
To make them plural add –s or –es.
Ejemplos:
El libro es interesante.
Los libros son interesantes.
La clase es difícil.
Las clases son difíciles.