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. The second conditional is used to talk about unreal present or future situations, using "if" clauses in simple past and main clauses with "would." The third conditional talks about unreal past situations, using "if" clauses in past perfect and main clauses in "would have" + past participle. Examples are provided for both.