Once upon a time, in the world before the internet, a good writer would equip herself with a copy of Strunk and White’s Elements of Style, and a copy of the New York Times Style Guide. Today life is easier for students with a wealth of on-line writing resources. Here’s a little gem of a handout from the Writing Centre at the University of North Carolina, complete with a built-in test for students. Follow the link and if you wish there’s a PDF version built into the link.