This document discusses the past tense in English. It explains that the past tense is used to talk about actions that were completed in the past. It describes the two types of past tense forms for verbs: regular verbs which are made past tense by adding "-d", "-ed", or changing the "y" to an "i" and adding "-ed"; and irregular verbs which have varying forms not predictable from the base verb. Examples of regular and irregular past tense verbs are provided. The document concludes by noting the irregular forms of verbs like "be", "do", "can/could" must be memorized.