http://www.eslgamesplus.com/irregular-past-tense-esl-grammar-jeopardy-quiz-game/

http://www.adelescorner.org/grammar/past_tense/past_regular.html

http://www.english-4u.de/past_tense_ex1.htm

http://www.perfect-english-grammar.com/past-simple-exercise-6.html