The simple past tense is used to talk about completed actions that occurred before now, regardless of duration. To form the simple past of regular verbs, -ed is added to the base verb form. There are several ways to structure sentences in the simple past tense, including affirmative statements using subject + past verb + complement, negative statements using subject + auxiliary verb + not + base verb form + complement, and interrogative statements using auxiliary verb + subject + base verb form + complement. Examples are provided of rewriting sentences in the simple past tense using these structures.