The document discusses the past simple tense in English. It provides examples of positive sentences using the past simple form, negative sentences using "did not" or "didn't", yes/no questions using "did" and the base verb form, and wh- questions using question words like "who", "what", "where", and "when" plus "did" and the base verb form. Examples are given of sentences using the past simple tense with subjects, verbs, and prepositions.