Heidi and Catehrine ________(sing) while Dave and Frank _______ (play) table tennis.
Heidi and Catehrine were singing while Dave and Frank were playing table tennis.
While Jenny and Molly___________ (talk), Amy__________ (do homework)
While Jenny and Molly were talking, Amy was doing homework
My cat _______(sleep) while I_________ (play) videogames.
My cat was sleeping while I was playing videogames.