The document discusses the simple past tense in English. It explains that the simple past is used to talk about actions that were completed in the past. It provides examples of regular and irregular verbs in the past tense. It demonstrates how to change sentences from present to past tense and how to form questions and negative sentences in the past tense. Examples are provided to illustrate forming the past tense of verbs, including changing "do" to "did" for questions and negatives.