This document discusses the 2nd conditional in English grammar. It begins by providing an example of a 2nd conditional sentence: "If it rained, we'd stay at home." It then explains that the 2nd conditional uses a past tense in the if-clause (e.g. "rained") and a modal verb like "would" in the result clause. The document outlines the steps to form an unreal present tense, which is used in 2nd conditional sentences to refer to hypothetical or unlikely present situations, such as "If I were rich, I'd buy a nice car." Overall, the document provides an overview of how to identify and construct 2nd conditional sentences in English.