This document discusses modal verbs in English. It provides examples of common modal verbs like can, could, may, must, ought to, shall, should, will, and would. It explains that modal verbs do not take "-s" in the third person and use "not" for negation. Modal verbs cannot be used in past or future tenses. Questions words like how much, how many, how old, and how often are also discussed. Exercises are provided to practice modal verbs and question forms.