The document discusses the first conditional, which uses the structure "if + present simple" followed by "future (will)". It provides examples of how to form the present simple using verbs like "be", other verbs with the infinitive, and negatives. Examples are given of the future tense using "will" and "won't". The first conditional is then defined using the structure "if + present + future" and sample sentences are provided. It concludes by noting the order of the clauses can be reversed.