1) The document is a presentation in Spanish on verb tenses in English including the past continuous, present continuous, and future continuous tenses.
2) It provides formulas and examples for forming sentences in the affirmative, negative, and interrogative forms of each tense.
3) Key details covered include that the past continuous describes actions occurring during a period in the past, the present continuous describes ongoing actions in the present moment, and the future continuous describes actions that will be ongoing in the future.