2 answers
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our = nuestro
possessive adjectives mi/mis = my
tu/tus = your (familiar, singular)
su/sus = his, her their or your (formal both singular & plural)
nuestro, nuestra, nuestros, nuestras = our
vuestro, vuestra, vuestros, vuestras = your (familiar, plural)
su escuela = could be his school, your school, your school AND their school
Sra