Great site by Paul Brians, an Emeritus Professor of English at Washington State University. Want to know when to use lay and when to use lie? How about the difference between full proof and foolproof? This site is for you!

Terms, exercises, tips, and rules about grammar. A fun site worth checking out!

Sponsored by the Capital Community College Foundation, this page has so much information on grammar that it makes my head hurt.

Created and maintained by the good folks over at the University of Ottawa. Canadians know a thing or two about proper grammar.