I WAS/WASN'T eating pizza.
I wasn't eating pizza.
We WERE/WEREN'T jumping.
We weren't jumping
They WERE/WEREN'T drinking water
They were drinking water
She WAS/WASN'T playing soccer
She was playing soccer
They WERE/WEREN'T brushing their teeth
They were brushing their teeth
He WERE/WAS swimming.
He was swimming
He WAS/WERE playing videogames.
He was playing videogames
They WERE/WEREN'T eating.
They were eating
I WERE/WAS studying Math
I was studying Math
She WAS/WASN'T driving.
She was driving
She WAS/WASN'T sleeping
She wasn't sleeping
He WASN'T/WAS running.
He was running