Question

nuestra escuela grande. es esta

Explanation:

In Spanish, "es" is the third - person singular form of the verb "ser" which is used for permanent or essential characteristics. Here, "Nuestra escuela es grande" means "Our school is big", indicating an inherent quality of the school. "Esta" is a form of the demonstrative pronoun/adjective and is not the correct verb form for this sentence.

Answer:

es