1) The document provides instructions for completing various grammar exercises in past simple tense including circling past simple verbs, filling in blanks with given past simple verbs, changing sentences to past simple, changing sentences to negative and interrogative forms, rewriting ideas as sentences, and completing a story with past simple verbs.
2) It asks the reader to perform tasks like asking and answering questions in the past simple tense and ordering words into sentences.
3) The exercises are meant to practice and reinforce the reader's understanding of past simple tense grammar.