This document discusses the use of be going to, present continuous, and will to talk about arrangements, future plans, predictions, and the differences between them. It provides examples of using each for arrangements ("Romy's having a Japanese lesson"), plans ("I'm going to be an astronaut"), and predictions ("It's going to be a sunny day"). Be going to is used for intentions and predictions based on evidence, present continuous for already arranged future events, and will for opinions about what may happen.