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 verbs must be memorized. The simple past can be used to talk about completed past actions, past habits, and past states. It also covers forming negatives and interrogatives in the past tense, as well as spelling rules and the uses of "to be" and "used to" in the past.