This document provides notes on conditionals and conditional sentences. It discusses four types of conditionals (types 0, 1, 2, and 3) and the tenses used in the if-clause and result clause for each. Type 0 and 1 conditionals are real conditionals using present or future tense. Type 2 uses past subjunctive and type 3 uses past perfect for unreal conditionals. It also discusses mixed conditionals, wish/hope, and if only constructions.