If you are flipping through your Spanish workbook and have landed on page 219, you have hit a crucial milestone in your language journey. The heading "Estructura 1" and the phrase "¿De quién es?" are not just random vocabulary exercises—they are the gateway to sounding like a native speaker when talking about ownership.
When a native speaker asks ¿De quién es esta chaqueta? , you don't have time to think: "De = of, quién = who, es = is... oh, jacket is feminine..." You must simply react: Es de ella. p219 estructura 1 de quien es practice it hot
Don't just read it. Don't just write it. Perform the drills. Make the mistakes. Correct them fast. By the time you close the book on page 219, you won't have to translate "de quien es" anymore—you will simply know who owns what. If you are flipping through your Spanish workbook