This document discusses the first conditional and how it is used to express possibilities in the future. Specifically, it notes that the first conditional is used when there is a possibility that doing a condition will achieve a certain result in the future. It provides examples of conditional sentences using "if" and discusses other conditional words that can be used like "can", "may", "might", "must", and "should". It also discusses conditional words like "when", "as soon as", "until", "unless", "provided that", and "as long as".