The document discusses the uses of the verbs "will" and "going to" to express future events or predictions in English. It provides examples of using "will" to make a promise, prediction, decision at the time of speaking, or state a fact about the future. It also gives examples of using "going to" to refer to a planned future event or make a prediction based on evidence or plans. The key difference highlighted is that "will" is used when something is decided at the time of speaking, while "going to" refers to events already planned or predicted based on existing conditions.