Then the following two examples show the response to the invitations

Part 4 concerns with formal letter of invitation
1. This kind of letter usually informs the recipient of the following items:
---aim
---topic
---sponsor
---place and time
---a registration form
---date for papers
---an introduction of local sightseeing tours, etc.
2. common expressions used in formal invitation letter
---we have pleasure in inviting you to _______ our annual conference
---we would be very grateful If you would _______consider giving us a keynote speech
---we would appreciate it if you could confirm your participation at your earliest

The following is a sample of formal invitation letter which is quite simple. If you have interest in this matter, you can come to the related exercise.

For this part, we are going to study the text discussing invitation culture in the USA. We will mainly focus on our study of some words.

In order to consolidate those important words, please do related exercise supplied by the present teacher.