NEW http://occawlonline.pearsoned.com/bookbind/pubbooks/brown5/chapter1/deluxe.html
http://www.rong-chang.com/ex/exeasy/lowtagquestions.htm
http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/173_grammarchallenge/page4.shtml
http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/173_grammarchallenge/page2.shtml
http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/173_grammarchallenge/page3
.shtml
http://downloads.bbc.co.uk/rmhttp/worldservice/learningenglish/grammarchallenge/pdfs/1_questiontags_practice.pdf