THEORY: http://www.slideshare.net/f2teacher/sl401-presentation#btnNext
Some practice exercises:
http://www.english-zone.com/grammar/questions4.html
http://www.tinyteflteacher.co.uk/learning-english/grammar/exercises/subject-object-questions.html
http://www.esl-lounge.com/student/grammar/3g26-subject-object-questions.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=719
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