These are IELTS sample letters, with questions and model answers showing you how to write informal, semi-formal, and formal letters. This is an IELTS Writing Task 1 Sample Answer from the general training test based on a letter to a friend.In this post, you'll find writing prompts, templates, and model answers for formal and informal letters. Trying to write a membership renewal letter but don't know where to start? There are three keys for writing letters. First, make sure that you get the level of formality correct.