PAST CONTINUOUS-EXPLANATION

https://www.myenglishpages.com/site_php_files/grammar-exercise-past-progressive.php

https://sapgrp.com.sg/sites/default/files/online_resource_files/Past%20Continuous%20Tense.pdf

http://www.macmillaninspiration.com/new/files/2010/12/Grammar-EXTRA_NI_3_Unit_1_Past-simple-and-past-continuous.pdf
https://yoquieroaprobar.es/3_eso/8/4/epastc4e1.pdf
https://www.grammarbank.com/support-files/past-simple-vs-past-continuous-worksheet-1.pdf
http://ferraz.redsagradocorazon.es/moodle/mod/folder/view.php?id=3276