http://www.really-learn-english.com/english-grammar-tenses.html#Past_Progressive
http://www.really-learn-english.com/english-grammar-tenses.html#Table_of_Contents
https://tefltastic.wordpress.com/worksheets/grammar/past-tenses/past-cont/
http://www.eltbase.com/vtr_refs.php?id=201#sub89
ACTIVITIES
http://edition.tefl.net/ideas/grammar/past-continuous-activities/
https://en.islcollective.com/resources/printables/worksheets_doc_docx/what_were_they_doing_yesterday/present-continuous-past/3501
PRACTICE
http://www.myenglishpages.com/site_php_files/grammar-exercise-past-progressive.php
http://www.englishpage.com/verbpage/verbs5.htm
https://www.englishclub.com/grammar/verb-tenses_past-continuous_u.htm
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https://inglescarmelitaslb.wordpress.com/category/grammar/
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http://www.really-learn-english.com/english-grammar-tenses.html#Table_of_Contents
https://tefltastic.wordpress.com/worksheets/grammar/past-tenses/past-cont/
http://www.eltbase.com/vtr_refs.php?id=201#sub89
ACTIVITIES
http://edition.tefl.net/ideas/grammar/past-continuous-activities/
https://en.islcollective.com/resources/printables/worksheets_doc_docx/what_were_they_doing_yesterday/present-continuous-past/3501
PRACTICE
http://www.myenglishpages.com/site_php_files/grammar-exercise-past-progressive.php
http://www.englishpage.com/verbpage/verbs5.htm
https://www.englishclub.com/grammar/verb-tenses_past-continuous_u.htm
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https://inglescarmelitaslb.wordpress.com/category/grammar/
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