<em>La alumna "PONE" los cuadernos en una mochila.</em>
My Hat, Your Hat: Understanding Possessive Adjectives
Singular Noun Plural Noun Translation
mi mis my
tu tus your (familiar)
su sus their, your, his, her , its
nuestro/a nuestros/as our
A) Sabían
They KNEW what they were doing.
I think this means "irregular endings"