This document provides examples and explanations for using the third conditional to talk about hypothetical or imagined situations in the past. It begins by explaining that the third conditional refers to imagining something different in the past using "if" plus "had" plus the past participle form of the verb. It then provides 16 examples of third conditional sentences and explains how to form third conditional sentences using "if", "had", and "would have" plus the past participle verb form. The document aims to help the reader better understand how to use the third conditional.