The document discusses the past simple tense in English. It explains that there are two types of verbs in the past simple: regular verbs which take "-ed" and irregular verbs which have varying past forms. It provides examples of regular verbs like "played" and irregular verbs like "went". The document also covers forming negative sentences and yes/no questions in the past simple. It emphasizes using "did/didn't" for regular verbs and "was/were" for the verb "to be" in questions and negatives.