This document discusses the simple past tense in English. It explains that there are regular and irregular past tense verbs. Regular past tense is formed by adding "-ed" to the base verb, following certain spelling rules. Irregular past verbs do not follow a set pattern and must be memorized. The simple past tense is used to indicate that an action was completed in the past. It provides examples of regular and irregular verbs in the affirmative, negative, and interrogative forms.