The document discusses the past simple tense in English. It provides examples of regular verbs formed with "-ed" and lists many common irregular past tense verbs. It explains that the past simple is used to talk about actions or states that were completed in the past, including things that happened once, several times, or for a period of time in the past. It also discusses how to form yes/no questions and negative statements using "did" and "didn't" with past simple verbs.