Use de when you name the owner. Use mi/tu/su when the owner is already known.
The most direct way to show ownership is using the formula . Example: ¿De quién es el libro? →right arrow Es de María (It is Maria's). p2-19 estructura 1 -de quien es -practice it -
Look at the object in parentheses and write a question asking whose it is. Use de when you name the owner