This document discusses the first conditional in English grammar. It explains that the first conditional uses "if + present simple" in the if-clause and "will + infinitive" in the main clause to talk about possible or unlikely future events. It provides examples of first conditional sentences with different subjects and verbs. It also discusses reversing the order of the if-clause and main clause. The document provides exercises for learners to practice forming first conditional sentences and concludes with the end of the lesson.