The document discusses verb tenses and their uses. There are three main tenses - past, present, and future. The past tense is used to describe completed actions in the past. The present tense expresses current actions or states of being. The future tense refers to actions or states that will occur in the future. Each tense has multiple forms including indefinite, continuous, perfect, and perfect continuous tenses. The document provides examples of how each tense is used.