SIMPLE PAST IRREGULAR VERBS

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http://oudwww.bonhoeffer.nl/engels/2eklas/unit3/2un3iv.htm

http://www.web-esl.com/Verbs/verbs1.htm

http://www.english-4u.de/past_tense_ex3.htm

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http://www.englishlab.net/hp/quiz11_past_simple_3_negative_sentences.htm

http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?05

http://www.learn-english-online.org/Lesson30/TestIt/SimplePastNeg.htm

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http://www.perfect-english-grammar.com/past-simple-exercise-5.html

http://www.englishbee.net/lessons/inter_exer/s_past/simple_past/simple_past_3/simple_past_3.htm

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