The document discusses the simple past tense in English. It describes three main uses of the simple past: to describe specific actions, completed actions, and past statuses. It explains the positive and negative forms of the simple past, including using "did" for negatives and questions. Finally, it provides examples of rules for regular and irregular verb forms in the past tense, such as adding "-ed" or changing spelling patterns, as well as examples of questions and negatives using "did".