This document provides examples of sentences using "can" and "have to" to express ability and obligation. For "can", examples are given to show it is used to express ability, such as "I can dance". Negative examples are also given using "can't". Questions are formed by placing "can" before the subject, such as "Can I dance?". For "have to", examples express obligations, such as "I have to work". Negative and question forms are also demonstrated. The document concludes by asking the reader to create their own example conversations using these structures.