The document discusses the past tense in English grammar. It provides examples of how the past tense is used to show completed actions at a certain time in the past, habitual or repeated actions in the past, and asking questions about past actions. It also discusses the different forms of verbs used in the past tense, including "was/were", "had", and "did". Lists of regular and irregular verbs are provided showing their present and past tense forms. Sample exercises are given demonstrating how to use the past tense correctly in sentences.