The document discusses using the grammatical structure "going to" to express actions that will occur in the future. It explains that "going to" followed by the base form of a verb is one of the simplest ways to talk about planned or predicted future actions. Examples are provided of using "going to" with different subjects like "I", "you", "he", etc. to discuss what someone is going to do. The structure of a "going to" sentence is broken down and rules for its use are reviewed.