The document provides instructions for using the modal verb "used to" in Spanish. It explains that "used to" translates to "sol鱈a" in Spanish. It provides examples of affirmative, negative, and interrogative sentences using "sol鱈a" to express something that was regularly done in the past but is no longer done. It demonstrates how to conjugate "sol鱈a" depending on whether the sentence is affirmative, negative, or interrogative.