1. The document provides information about formal and informal invitations and replies to invitations. It discusses the key points to remember for each type of invitation and reply.
2. Examples are given for formal printed and non-printed invitations for events like marriages and school functions. Key details like the host, date, time, venue, purpose are included.
3. Informal invitations are more casual in tone using first and second person. Examples include inviting a friend to a house warming ceremony.
4. Replies can be formal or informal. Formal replies are brief and courteous while informal replies use ordinary letter format and first person. Examples are given for accepting and refusing invitations.