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questions with and without auxiliaries http://www.oup.com/elt/global/products/englishfile/preint/a_grammar/file02/grammar02_c01/ http://www.rong-chang.com/writing/wh_questions01.htm http://www.rong-chang.com/writing/wh_questions02.htm http://a4esl.org/q/h/vm/queswor.html http://www.englisch-hilfen.de/en/exercises/questions/question_words2.htm