QUESTIONS

http://www.shertonenglish.com/resources/es/questions.php

http://learnenglish.britishcouncil.org/en/grammar-exercises/question-forms-su…

http://www.esl-lounge.com/student/grammar/3g26-subject-object-questions.php

http://www.englishexercises.org/makeagame/viewgame.asp?id=719

http://www.engvid.com/auxiliary-verbs-in-conversations/

http://www.engvid.com/advanced-yes-no-questions/