1) The document discusses the form and usage of the past simple tense in English. It covers regular and irregular verbs in the past simple, questions, and negatives.
2) Examples are provided to demonstrate how to form the past simple of regular verbs by adding "-ed" and how irregular verbs have special past forms. Questions, negatives, and spelling rules are also explained.
3) Different usages of the past simple tense are outlined, including to talk about completed actions at specific times in the past, to list a series of completed actions, to describe durations or habits that are no longer true. Time expressions that can be used with the past simple are also mentioned.