The letters can be as friendly or official. A friendly greeting and interpersonal relationship used. A more formal for commercial, administrative, educational, and political will. Through official letters, business letters that are most used for a variety of communications and business applications used and how to write their own.
Congratulations
Student
applying for
Affidavit
Thank
Disclaimer
Acknowledgements
A bank
Resignation
Protest
Invitations
Contracts
Goodbye
official letters
will
Condolence
Careers
And...