Question

Presente Passado
I am walking
I WAS walking
They are sleeping
They WERE sleeping



Presente Passado

My parents are working _________________________________________________________
My sister is studying chemistry ___________________________________________________
My dog is sleeping ______________________________________________________________
I am watching videos on Youtube __________________________________________________
Ana and Paula are buying clothes __________________________________________________

Answer 1

É simples, quando for Am, vai ser Was. E quando for Is/Are, vai ser Were.