The link below is the home page for the Shurley Method. Shurley is used in addition to the Houghton Mifflin English textbook for grammar skills. http://www.shurley.com/pub/index.jsp?go=elements&sub=&tab=jingles
This is a GREAT site for language arts! http://www.ecarter.k12.mo.us/dept/elementary/fourthgrade/ccrites/englishpage.html