¡Buena suerte y a practicar! (Good luck, and get practicing!)
This exercise is a "Practice it!" activity, which typically involves a series of interactive or written questions. Students are presented with an object and prompted to answer, "¿De quién es?" by stating who owns it. These answers can use possessive phrases like "el libro de Juan" (Juan's book) or possessive adjectives like "su libro" (his/her/their/your book). The goal is to practice both asking about and declaring ownership with confidence. p2-19 estructura 1 -de quien es -practice it -
Crucially, these adjectives must with the thing being owned, not the owner. For example: ¡Buena suerte y a practicar