If you need to, please revise your assignment as soon as possible, and let me know when you're ready to have it graded again.
Here's an example of a well-done letter:
http://cavemana1.pbworks.com/Great-Example-of-a-Letter
And here's an great example of the whole assignment:
http://cavemana1.pbworks.com/Great-Example-of-the-Whole-September-Assignment