Inglês - tag questions

Explicação - site em português: http://grammarnet.com/gnav/c_tags.php

Os seguintes links têm exercícios sobre tag questions:
http://www.english-zone.com/grammar/tags01.html
http://www.english-zone.com/grammar/tags04.html
http://www.englishclub.com/grammar/verbs-questions-tag_quiz.htm
http://a4esl.org/q/f/z/zz13mlc.htm
http://www.learn-english-today.com/wordgames/hotpot-match/q-tags1.html
http://www.better-english.com/grammar/questiontags.htm
http://www.englishmedialab.com/Quizzes/preintermediate/Tag%20questions%20quiz.htm
http://a4esl.org/q/h/fb006-bp.html
http://www.cad.ntu-kpi.kiev.ua/~demch/friends/esl4rus/libr/quizzes/iteslj/m-tag01.html
http://www.cad.ntu-kpi.kiev.ua/~demch/friends/esl4rus/libr/quizzes/be/questiontags.htm
http://a4esl.org/q/h/fb006-bp.html
http://a4esl.org/q/h/lb/tagqds.html
http://www.cad.ntu-kpi.kiev.ua/~demch/friends/esl4rus/libr/quizzes/iteslj/m-tag02.html

---