This document discusses verb tenses and their uses. There are three main tenses - past, present, and future. The past tense expresses actions, activities, and states of being that were completed in the past. The present tense expresses ongoing or habitual actions and states in the present. The future tense expresses actions, activities, and states that will occur or be true in the future. Each tense has multiple forms including indefinite, continuous, perfect, and perfect continuous tenses. Examples are provided to illustrate the uses of each tense.