The document describes the characteristics and structure of sentences using the past simple tense in English. It provides examples of affirmative sentences which use the pronoun or subject plus past form of the verb plus a time expression. Negative sentences use the auxiliary "didn't" or "did not" plus the present form of the verb and a time expression. Interrogative sentences use the auxiliary "did" plus the subject, present form of the verb, and a time expression followed by a question mark. It also lists examples of adjectives used for comparison, including comparative and superlative forms.