The document discusses the simple past tense in English. It explains that there are two types of verbs used in the simple past: regular verbs that end in "-ed" like "played" and "studied", and irregular verbs that do not follow a pattern like "went" and "saw". It provides examples of sentences using regular and irregular verbs in the simple past. It also describes how the past form of "do", which is "did", is used in negative and interrogative sentences in the simple past.