http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-6036.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-30994.php
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences3.htm
http://www.theyellowpencil.com/tosimplepast1.html
2 days ago
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