videos:
https://www.youtube.com/watch?v=C0OL3B8lmYs
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http://www.agendaweb.org/verbs/past_simple-exercises.html
http://www.adelescorner.org/grammar/past_tense/past_regular.html
http://www.bradleys-english-school.com/online/speedword/spdwrdpast1
questions
http://first-english.org/english_learning/english_tenses/simple_past/2/55_english_questions_exercises.htm
http://www.english-grammar-lessons.com/pastsimple/exercise3.swf