http://clicknlearn.net/
www.members.iinet.net.au/~adelegc/grammar/past_tense/past_regular.html
www.oup.com/elt/global/products/englishfile/elementary/a_grammar/file05/grammar05_c01/
www.better-english.com/grammar/past5.htm
www.englishlab.net/hp/quiz12_past_simple_4_negative_sentences.htm
eslprograms.vcc.ca/ESLWEB/gramrev2.htm
www.english-room.com/negative_6.htm
www.bradleys-english-school.com/online/concentration/past3.html
www.ego4u.com/en/cram-up/tests/simple-past-1
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