This document discusses different types of conditional sentences used in English. It focuses on real conditionals, which express situations that can actually happen. Real conditionals can be present, past, or future. The document provides examples of present and past real conditionals, which refer to situations that are always true. It also discusses first conditional sentences, which are used to talk about likely future events and make predictions using the structure "if + present, will/modal + base verb". Examples are provided of first conditional sentences referring to future travel plans and predictions.