Spanish adjectives usually come after nouns. Their form must agree with the gender and singular/plural form of the noun they follow.
Gender – adjectives that end in ‘o’ are masculine and change the ‘o’ to change gender:
un pueblo bonito (a beutiful town), una chica bonita (a pretty girl)
un chico bueno (a good boy), una comida buena (a healthy food)
Un vino sabroso (a tasty wine), una manzana sabrosa (a tasty apple)
Other adjectives don’t change:
un doctor paciente, una persona paciente
un señor amable, una señora amable
un profesor disponible, una profesora disponible
Singular/Plural – adjectives that end in a vowel without an accent add an ‘s’ when plural :
blanco – blancos (white)
grande – grandes (big)
pequeño – pequeños (small)
Adjectives that end in consonant, or in a vowel with an accent, add ‘es’ when plural:
hombre trabajador (hard-working man), trabajadores (hard-working men)
documento importante (important document), documentos importantes (important documents)
marroquí (Moroccan man), marroquíes (Moroccan men)