How do you use adjectives with nouns in Spanish?

Adjectives agree with the noun in number and gender.

Mark the correct form in each case:

El coche es grande / grandes
The car is big

Las casas son bonitos / bonitas
The houses are beautiful

El chico es joven / jóvenes
The boy is young

La silla es pequeño / pequeña
The car is small

Los deportistas son fuertes / fuertes
The sportsmen are strong