江苏开放大学综合英语（基础）BBS听说学习 主题讨论: invitation

Explain what we should pay attention to when making, accepting and declining an invitationThe format is as follows:
When making an invitation, we should…when accepting an invitation, we should…when declining an invitation, we should..得分标准:
能说出在发出、接受、拒绝邀请时的注意事项。