The document discusses using will and be going to for expressing future time. It provides examples of when to use each: 1) Will is used to make decisions, state future facts, make promises, or make predictions qualified with words like "think", "guess", or "hope". 2) Be going to is used for planned future events or predictions based on evidence. 3) The document provides examples of sentences using will and be going to and questions for the reader to practice using each.