This document discusses the differences between using will and be going to when expressing future tense in English. Will is used for instant decisions, predictions not based on evidence, and promises or offers. Be going to is used for future plans and intentions that are based on evidence in the present. Both can sometimes be used interchangeably but often convey slightly different nuances. The document also provides examples of affirmative, interrogative, and negative forms of will and be going to, as well as common time expressions used with future tenses.