The document discusses the simple past tense in English. It explains that the simple past is used to talk about actions that were completed in the past, and provides examples using common time expressions like "yesterday" and "two years ago." It describes how regular verbs are formed by adding "-ed" in the past tense, while irregular verbs do not follow a set pattern and must be memorized. Examples are given of different types of irregular verb forms, including those that undergo vowel changes, add double consonants, or stay the same between present and past. Positive and negative examples are provided using did/did not with regular and irregular verbs. Practice exercises are included at the end to reinforce use of the simple past tense.