The document discusses the past simple tense in English. It explains that regular verbs are formed by adding "-ed" while irregular verbs have varying forms, which can be grouped into patterns. Common irregular verb patterns include "speak-spoke" and "see-saw." The past form of "to be" is "was/were." The past simple tense is used to describe finished past actions and actions that occurred one after another. It provides examples of positive, negative, and yes/no question sentences in the past simple tense, including using "did/didn't" for regular verbs and "was/were" for the verb "to be."