How to form the past progressive:
Practice the tense:
Play Kahoot
Play riddle
https://en.islcollective.com/english-esl-worksheets/grammar/past-simple-or-past-continuous-tense/detective-stories/93844
Link to islcollective
Many "long" actions at the same time:
ISLCOLLCTIVE
Video - casino mode
https://en.islcollective.com/video-lessons/s-halloween-past-simple-continuous
Direct link
https://view.genial.ly/5f96f2e67a095f0cf8d462c6/game-breakout-escape-room-past-continuous