This document discusses the simple past tense in English for talking about past actions. It explains that regular verbs are made past by adding "-ed", except for verbs ending in "e" which only add "d" and verbs ending in consonant-y which change the y to i and add "ed". It also notes some irregular verbs like "visit" and "happen". It provides examples of using the simple past in negative and interrogative sentences, where the auxiliary verb is used and the main verb remains in the infinitive form.