1) The document discusses the different ways to express future tense in English using will and going to. 2) Will is used to express decisions, predictions based on present evidence, and promises or offers. Going to is used to express future plans and intentions, as well as predictions based on what can be seen at the moment. 3) Other ways to express the future include using the simple present and present progressive tenses with time expressions indicating future time. The future progressive and future perfect tenses are also discussed.