GRAMMAR-Possessive+Adjectives

The words for ‘**my**’, ‘**your**’, ‘**his**’ and ‘**her**’ change according to whether the noun they describe is **singular** or **plural**.
 * || ** singular ** || ** plural ** ||
 * **// my //** || mi profesor || mi**s** profesor**es** ||
 * **// your //** || tu estuche || tu**s** estuche**s** ||
 * **// his / her //** || su mochila || su**s** mochila**s** ||
 * //**your (formal)**// || ====su mochila==== || ====sus mochilas==== ||
 * //**our**// || ====nuestro libro====

nuestra mochila
|| ====nuestros libros====

nuestras mochilas
||
 * //**your (plural)**// || ====vuestro libro====

vuestra mochila
|| ====vuestros libros====

vuestras mochilas
||
 * //**their**// || ====su libro==== || ====sus libros==== ||
 * **//your (plural-formal)//** || ====su libro==== || ====sus libros==== ||