The document discusses the simple past tense in English. It provides the conjugations of to be and regular and irregular verbs in the simple past. It also describes how to form the past tense of regular verbs and gives examples of using the simple past to talk about completed past actions, actions that took place over a period of time in the past, and habitual or repeated past actions. It lists common time expressions used with the simple past and provides a matching exercise with explorers and their accomplishments.