Okay - I don't do these very often - but this was was so intriguing. I have a bit of a pet peeve about bad spelling and grammar - and while I make mistakes myself occasionally I can hardly resist the urge to correct mistakes when I see others make them. I found this quiz at my friend DeeDee's blog. She is evidently a grammar whiz as well!
Your Language Arts Grade: 100%
Way to go! You know not to trust the MS Grammar Check and you know "no" from "know." Now, go forth and spread the good word (or at least, the proper use of apostrophes).