The document discusses the simple past tense in English. It explains that the simple past is used to talk about actions that started and finished at a specific time in the past. It also provides examples of common time expressions used with the past tense, such as "yesterday" and "two years ago." The document goes on to explain how regular verbs are conjugated in the past tense using "-ed", while irregular verbs do not follow a set pattern and must be memorized. It provides lists of regular and irregular verbs, and provides guidelines for forming negative and yes/no questions in the past tense.