6th YEAR: TAG QUESTIONS

http://www.perfect-english-grammar.com/tag-questions.html
http://www.englisch-hilfen.de/en/exercises/questions/question_tags3.htm
http://www.ego4u.com/en/cram-up/grammar/question-tags/exercises
http://www.englisch-hilfen.de/en/exercises/questions/question_tags2.htm