This document explains the first conditional structure in English grammar. The first conditional is used to talk about possible situations in the present or future. It is formed by an "if clause" with a simple present tense verb followed by a "main clause" with a future tense verb using "will". Several examples are provided to illustrate talking about things that may happen, such as "If it's sunny, we'll go to the park". The document also includes exercises for readers to practice forming their own first conditional sentences.