The document discusses the simple future tense in English using "going to" and "will". It provides formulas and examples for forming positive, negative, and interrogative sentences in the simple future tense. For sentences with "going to", it is used to express plans and predictions when there is evidence. For sentences with "will", it is used to make quick decisions, offers, promises, and predictions without evidence. The document also includes exercises from the book English Time for readers to practice. In the end, it lists the references used.