grammar.adjectives.agreement
Adjective agreement: gender and number
Adjectives match their noun: -o adjectives have four forms (rojo/roja/rojos/rojas); -e and most consonant adjectives have two (grande/grandes, fácil/fáciles).
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Explication
Spanish adjectives agree with their noun in gender and number. The largest group ends in -o and has four forms: rojo, roja, rojos, rojas; alto, alta, altos, altas. Match the noun: las oficinas nuevas, un coche rojo.
Adjectives ending in -e or in most consonants have just two forms (singular/plural), with no gender change: grande/grandes, inteligente/inteligentes, fácil/fáciles, azul/azules. Two sub-cases do add -a for the feminine: nationality adjectives (francés → francesa, español → española) and those ending in -or (trabajador → trabajadora).
Plurals follow the noun rules: add -s after a vowel (altos), -es after a consonant (difíciles, azules), and z → ces (feliz → felices). With a mixed-gender group, the masculine plural wins: un hombre y dos mujeres altos.
Exemples
The new offices are big.
Région: global
It's a difficult decision.
Région: global
We bought comfortable chairs and a round table.