This document provides expressions for making, accepting, and refusing invitations in English. For making invitations, it lists phrases like "Do you want to...", "Would you like to...", "Let's...", and "How about...". For accepting invitations, common responses include "Sure.", "I'd love to.", and "Sounds good.". For refusing invitations, potential replies involve mentioning having other commitments like work, classes, appointments or plans. It also gives examples of invitation dialogues and is sourced from an English learning website.