This document discusses the simple past tense in English. It explains that there are regular and irregular past tense verbs. Regular verbs are formed by adding "-ed" to the base verb, with some exceptions for verbs ending in consonant-vowel-consonant or "e". Irregular verbs have complex changes in spelling and pronunciation to form the past tense. The purpose of using past tense verbs is to indicate that an action occurred and was completed in the past. It also notes the three main pronunciations of the "-ed" ending on regular past tense verbs.