This document discusses the uses of the verb "have" in English. It explains that "have" can be used as both a main verb and an auxiliary verb. As a main verb, it is used to indicate possession or experiences. As an auxiliary verb, it is used to form perfect tenses and with "have to" to express obligation. The document provides examples of "have" and "has" being used in different contexts, including possession, forming questions and negatives, contractions, and with modal verbs. It also assigns a grammar exercise for students to complete.