question tags

Grammar & exercises

http://www.englisch-hilfen.de/en/grammar/qu_tags.htm

http://esl.about.com/library/quiz/blgrquiz_tags.htm

Exercises

http://www.better-english.com/grammar/questiontags.htm

http://club.telepolis.com/englishweb/genitivetags.html

http://www.englishexercises.org/buscador/buscar.asp?nivel=any&age=0&tipo=any&contents=tag+questions

http://www.agendaweb.org/grammar/questions_tag.html

http://www.english-test.net/esl/learn/english/grammar/ei037/esl-test.php

http://www.polseguera.org/advanced_english_grammar/question_tags.php