Question

which sentence is grammatically correct?
o los niños son fuertes.
o los niños son paciente.
o los niños son serias.
o los niños son cansado.

Explanation:

In Spanish, adjectives must agree in number and gender with the nouns they modify. "Los niños" is masculine plural. "Fuertes" is the masculine - plural form of "strong", while "paciente" is singular, "serias" is feminine plural, and "cansado" is singular masculine.

Answer:

Los niños son fuertes.