They have to agree
Adjectives are like mirrors:
they reflect the gender and
number of the noun they
modify.
Adjective = Noun
in form
Nouns have gender and number
in Spanish and so the adjective
must reflect the same gender and
number as its noun.
El chico simpático
or
La chica simpática
or
Los chicos simpáticos
or
Las chicas simpáticas
Regular adjectives--those that end in o--change to the
feminine by dropping the -o and adding -a; they then
change to the plural by adding -s to either form:
Masculine:
Feminine:
Singular:
alto
alta
Plural:
altos
altas
Most irregular adjectives--those that end in a letter
other than o--only change the ending to indicate
plurals. If the adjective ends in a consonant, the
plural form adds -es.
Masculine:
Feminine:
Singular
fácil
fácil
Plural
fáciles
fáciles
Adjectives of nationality that end in consonants:
add -a to form the feminine in singular,
which then forms its plural by adding -s.
El chico japonés El libro alemán
La chica japonesa La revista alemana
El restaurante español
La cafetería española
Some other exceptions to the previous rules are
adjectives
that end in E-L-Z
Inteligente
Dificil
Feliz
These are both: masculine and feminine;
No need to make any changes on gender.
Adjectives that end in -or add -a to form the feminine:
El estudiante trabajador
La estudiante trabajadora
Adjectives that end in -z change the -z to -c and
then add -es to form the plural:
La estudiante feliz
El estudiante feliz
Los estudiantes felices Las estudiantes felices
If more than one adjective modifies and follows a
noun , you may connect them with the conjunction -y:
Una muchacha simpática y interesante
or
Un muchacho bajo y ágil