Here you have a good link to keep practising the Past Continuous: Affirmative, Negative, Questions and short answers `the gerund (-ing). Try the tests at the end too!
GAME: These days the Siberian cold weather is affecting us hey... Why don't we try the freezing game? Two groups: one closing the eyes, the other performing the action Teacher says FREEZE, group 2 stays still, group one has to guess what the action was. Let's play!
(E.g. You were playing basketball).