1) The document discusses the simple past tense in English grammar. The simple past is used to describe events that were completed in the past or activities that started and finished at a specific past time.
2) It provides formulas for constructing positive, negative, and interrogative sentences in both the verbal and nominal forms in simple past tense. Regular verbs form the past tense by adding "-ed" while irregular verbs do not follow a set pattern.
3) Examples are given to illustrate the different sentence structures in simple past, including the use of adverbs of time. Exercises from an English textbook are recommended for practicing simple past tense constructions.