This document provides examples of mild and strong language for opening and closing remarks in letters or emails of complaint. Mild language uses a quiet, polite tone to communicate an issue, while strong language is more direct and forceful. For openings, mild options include stating that you are writing about an issue, while strong options directly express dissatisfaction. Similarly, mild closing options express hope for resolution, while strong closings demand action or threaten further steps. The document aims to show appropriate vocabulary for different levels of tone when writing complaints.