PAST SIMPLE vs. PAST CONTINUOUS

USE: They are used in the same sentence when an action in progress (past continuous) was INTERRUPTED by another action (past simple).

                          I was having a shower when the phone rang
                             action in progress                                                          action that iterrupts
                             (past continuous)                                                             (past simple)

STEP 1 : GAME
http://www.eslgamesplus.com/past-progressive-past-continuous-past-simple-verb-tenses-esl-grammar-interactive-activity/

STEP 2 :  ACTIVITIES

https://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html

https://www.english-grammar.at/online_exercises/tenses/past-simple-progressive2.htm