The document defines and provides examples of simple past and present tenses in English. It begins by defining verbs and their forms, then defines simple past tense as expressing completed past actions or events. The simple past tense formula is given as subject + verb-2 for positive sentences, subject + did + not + verb-1 for negative sentences, and did + subject + verb-1 + ? for interrogative sentences. Example sentences are provided. Simple present tense is then defined as expressing present or ongoing habits, facts or circumstances, with formulas like subject + verb-1(s) given for positive sentences.