1. The document discusses modal verbs, which are used to express meanings like ability, obligation, permission, and possibility. It defines modal verbs and explains how they differ from normal verbs.
2. The document separates modal verbs into categories based on their functions. It focuses on modal verbs expressing permission, such as may, could, and can. Examples are provided to demonstrate the appropriate contexts to use each modal verb.
3. Exercises are included for students to practice using modal verbs of permission in sentences. A comic strip is also provided as a prompt for using may, could, or can in questions or statements.