http://s.mound.free.fr/skyblues67/WasWereVing/conjwasworking.htm
http://www.english-grammar-lessons.com/pastcontinuous/exercise2.swf
http://mrbrownslearningspace.com/wp-content/uploads/2015/01/Past_Progressive_1.htm
http://www.english-grammar-lessons.com/pastcontinuous/exercise3.swf
http://cerquella.com/bilingual/deploy2/Unit3/grammar_1.html
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