The key to exercise solutions in chapter 8 - Grammar - Unreal past and regrets - wish, if only, it's time and would rather for the textbook Into Focus B2 with authors Sue Kay, Vaughan Jones, Silvia Minardi, Daniel Brayshaw from Pearson Longman
Question
Who said what? Write B for Ben, E for Ellie, M for Mum and D for Dad. Then listen again and check.