As part of my long project to help users of this site learn (or teach) about errors in usage frequently made by English speakers, I have now added links to a series of FUN and EXCITING quizzes to the Common Errors in Usage page. Now you can improve your grammar while reading about fascinating topics like the Justice League’s new kitten Katana, Tim Duncan’s spiritual experience at a ping pong monastery, and Gimli’s getting friend zoned by Galadriel. Just click on the link above and learn away.