PAST CONTINUOUS: When I was crossing the street, I saw a twister in the distance...



http://www.helpforenglish.cz/gramatika/slovesa/casy/minule/c2006123001-Minuly-prubehovy-cas--past-continuous-.html
http://www.englishpage.com/verbpage/pastcontinuous.html
http://www.ego4u.com/en/cram-up/grammar/past-progressive
http://www.englishclub.com/grammar/verb-tenses_past-continuous-quiz.htm
http://www.englisch-hilfen.de/en/exercises_list/zeitformen.htm   exercises with title "past progressive"
http://www.isabelperez.com/happy/tenses/past_cont.htm

Past simple x past continuous:
http://www.speakspeak.com/html/d3b003_cviceni_anglicke_gramatiky_past_simple_continuous_cz.htm
http://jazykovetesty.cz/test/297/
http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/menu.php
http://esl.about.com/od/grammarstructures/p/g_pastsc.htm
http://www.major.profitux.cz/vyuka/hotpot_nove/past_cont_s_napovedou.htm

......for advanced learners:
http://www.learnenglish.de/Games/Tenses/PastSvsPastC.htm

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