How To Write A Letter To An Unfamiliar Friend . You can always write a friendly letter to a friend who is miles away. Mention a person who will assume your duties while you are away. Letter Writing Format To A Friend Fresh Informal Letter Format To from www.lisbonlx.com You can always write a friendly letter to a friend who is miles away. Write their house number and street address on the line below it. The advice and moral support and happiness you.