This document provides an introduction to unreal conditional sentences. It begins by stating the goal is for students to learn about unreal conditional sentences and be able to use them to describe impossible situations. It then defines unreal conditionals and outlines the two types: second and third conditional. Second conditional is used to talk about unreal present or future situations using "if" clauses in simple past and main clauses with "would." Third conditional is used for unreal past situations, forming the "if" clause in past perfect and the main clause with "would" and present perfect. Examples are provided for both.