The document discusses the simple past tense and its uses in 3 sentences or less: 1. The simple past tense is used to talk about completed actions, events, or situations that occurred in the past and are now finished, with the time reference given using words like yesterday, last week, etc. 2. Regular verbs are made in the simple past tense by adding "-ed" and irregular verbs have their own past tense forms. 3. The simple past tense can be used in affirmative, negative, and interrogative sentences with both regular and irregular verbs.