The document discusses the usage of the past simple tense in English. It provides examples of how the past simple can be used to express actions that started and finished at a specific time in the past, list a series of completed actions, describe actions that occurred over a duration of time in the past, and describe past habits or facts that are no longer true. It also covers the formation of the past simple form for regular and irregular verbs, questions and negative forms, and common time expressions used with the past simple tense.