Once you've mastered Estructura 1 , you can use possessive adjectives ( mi , tu , su , etc.) for more specific sentences. For instance, instead of "el coche es mío," you could say " coche" or use the possessive pronoun in longer answers.
If you are stuck on a specific question from page 219, try reading the sentence out loud, mapping out who owns what on a piece of scratch paper, and checking your noun-adjective agreements. p219 estructura 1 de quien es practice it hot