http://a4esl.org/q/f/z/zz86skm.htm
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_statements.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pasted2.htm
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences2.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-9977.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=54
http://www.englishexercises.org/makeagame/viewgame.asp?id=1678
http://www.englishexercises.org/makeagame/viewgame.asp?id=2316
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-5183.php
http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-11.php
http://www.english-online.org.uk/games/pasttense2.htm
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