Those are your shoes. (Speaking to more than one person)
Those are their shoes.
In each of these sentences, the possessive pronoun (in bold) modifies or describes the noun "shoe" or "shoes."
Possessive adjectives are sometimes called possessive pronouns. However, possessive adjectives are not true pronouns in that they cannot replace nouns in a sentence; their function is only to modify nouns. A possessive pronoun is a word that attributes ownership to someone or something without using a noun. ...