Possessive adjectives in English are as follows: myouryour his, her,their its
Possessive adjectives in Spanish: minuestro tuvuestrosu Because these are possessive adjectives, they change just like all other adjectives: mi casa, mis casas nuestro libro, nuestros libros, nuestra casa, nuestras casas tu casa, tus casas vuestro libro, vuestros libros, vuestra casa, vuestras casas su casa, sus casassu casa, sus casas Mi, tu, and su have just singular and plural forms, because they don’t end with an –o. Nuestro and vuestro, which do end with an –o, have four forms: masculine singular, feminine singular, masculine plural, feminine plural.
minuestro tuvuestrosu “Su” can mean “his,” “her,” “its,” “their,” or “your.” “Sus” can mean “his,” “her,” “its,” “their,” or “your.” You use “su” when the noun is singular: su libro = his book, her book, your book, their book sus libros = his books, her books, your books, their books The only thing the –s on the end of the “su” tells you is that the noun is plural. It tells you absolutely nothing about whether the word means his, their, etc.
What you can do if it’s not clear whether “su” means “his,” “her,” etc., is this: su libro = el libro de él su libro = el libro de ella In other words, you can say “the book of him” rather than “his book.”
That brings us to another point: there are no apostrophes in Spanish. The way you say, “Juan’s watch,” is “the watch of Juan”: El reloj de Juan
Práctica: Posesivos My bicycle - Mi bicicleta Your school -Tu escuela His monkey- Su mono Our beach-Nuestra playa Juan’s backpack-Mochila de Juan Her mother-Su madre Their fatherSu padre His pens- Sus plumas