Here's a selection of "complaining language" from the British Council, Madrid Adults. Particularly formal language is in italics. Some introductory sentences: I am writing to you to express my indignation / outrage that I feel I must complain about the manner in which I am writing to you following a most regrettable incident I am somewhat concerned about something which occurred I am writing to you because I feel I can no longer put up with - direct! I feel I must express my deep unease at the manner in which I would just like to mention a little problem which has cropped up/ arisen concerning Detailing the complaint: I was absolutely outraged to learn that - direct! I find it quite appalling/ most regrettable/ totally unacceptable that X should + verb - direct! It is quite beyond belief that a grown adult should + verb - direct! I was quite amazed to discover that - direct! You can imagine my surprise when It is rather unfortunate that he should + verb Apportio...