1) The document defines and describes the simple past tense in English. The simple past tense is used to talk about actions or events that were completed in the past.
2) It lists five characteristics of the simple past tense: it indicates a specific past time, uses the past form of verbs, is the only grammatical past tense, uses a subject + past verb + complement structure, and can include time expressions.
3) Examples of regular and irregular past tense verbs are provided, as well as examples of affirmative and negative sentence constructions using the simple past tense.