This document explains how to use the second conditional to talk about hypothetical or imaginary situations. It provides examples of second conditional sentences using "if + past tense" followed by "would/wouldn't + infinitive". It compares the second conditional to the first conditional and discusses using "would/wouldn't + infinitive" without an if clause. It also discusses using "could" and "might" with the infinitive in the second conditional. Finally, it provides examples of asking questions in the second conditional.