The document discusses the different verb tenses in English, including present, past, and future tenses. There are three main tenses - present, past, and future. Within each main tense there are four forms - simple, continuous, perfect, and perfect continuous. Each tense form has a specific formula and usage to indicate the time or progression of an action. Examples are provided to illustrate how to conjugate verbs in the affirmative, negative, and interrogative forms of each tense.