The document discusses the simple past tense in English. It explains that the past tense of regular verbs is formed by adding "-ed" or "-d" to the base verb form. Irregular past verb forms must be memorized as they do not follow patterns. The simple past is used to talk about actions that happened at a specific time in the past or actions that happened repeatedly or over a period of time in the past but not now. It provides examples of forming affirmative, negative and interrogative sentences in the past tense for both regular and irregular verbs.