sleep/swim
She is swimming./She isn't sleeping
play/read
He is reading./He isn't playing
swim/run
She is running/She isn't swimming.
run/climb
He is running./ He isn't climbing.
eat/sing
He is singing./ He isn't eating
swim/play football
He is playing football./He isn't swimming.
run/eat
She is eating./She isn't running
eat/drink
He is drinking./He isn't eating