The document discusses the past simple tense in English. It explains that there are regular and irregular verbs. Regular verbs form the past tense by adding "-ed" while irregular verbs have unpredictable spelling changes. It provides examples of common irregular verb patterns. The document also covers how to form negative sentences and yes/no questions in the past simple tense using verbs like "do", "be", and others. It emphasizes using the past simple tense to talk about completed actions in the past.