The document discusses the verb "to be" in English. It is one of the most common verbs and is irregularly conjugated. It is used to link subjects to qualities, names, or states. The verb "to be" can also be used as an auxiliary verb. The document outlines the affirmative, negative, and interrogative forms of the verb "to be" including both contracted and full forms. It also discusses the different types of wh-questions in English that ask about specifics like what, which, where, when, why, how, how often, how many, and how much.