The possessive adjective must agree in number with the , not the owner.

Page 219, Estructura 1 is not just a box in a textbook. It is the framework for every conversation about lost keys, borrowed jackets, and forgotten lunches. The question will follow you from the classroom to the coffee shop to the airport lost-and-found.

"Hay un teléfono celular en la mesa. ¿De quién es?"

This practice activity focuses on identifying ownership and using the correct forms of the verb (to be) alongside possessive constructions. In Spanish, ownership is typically expressed using the formula: [Item] + [verb ser] + de + [Owner] Example: "El libro es de María." (The book is Maria's.) Key Practice Points Based on similar exercises in this curriculum:

The verb ( es or son ) must agree in number with the object being owned, not the owner.