1. The document discusses different ways to talk about the future in English using future tenses.
2. There are several forms used including the future simple with "will", "be going to", the present continuous, and the present simple.
3. The future simple with "will" is used to express sudden decisions, intentions, promises, and predictions based on opinion. "Be going to" expresses intentions and predictions based on something that is already arranged or planned. The present continuous talks about future events that have been arranged, while the present simple discusses unchangeable future events.