The document provides examples of ways to express invitations and offers, refuse invitations, and accept invitations in conversations. It lists common phrases used for each, such as "Would you like to..." and "I'd love to..." for invitations, "I'm sorry, but I can't" for refusing, and "Yes" or "Sounds great" for accepting. It then gives two example dialogues, one where an invitation to the cinema is accepted and another where an invitation for a drink is initially refused but then accepted for a quick drink.