The document discusses rules for forming the past tense of regular verbs in English. It explains that most regular verbs are formed by adding "-ed" to the base form. However, for verbs ending in "e" or "ie", only "d" is added, and for single-syllable verbs ending in a consonant, the consonant is doubled before adding "-ed". Examples are provided like "brushed", "liked", "stopped" to illustrate how the rules are applied to form the past tense of regular verbs.