Respuesta:
I was playing football yesterday
We were playing videogames last night
She was playing chess last night
They were studying English yesterday
We were learning English last year
Negativa:
I wasn't playing football yesterday
We weren't playing videogames last night
She wasn't playing chess last night
They weren't studying English yesterday
We weren't learning English last year
Interrogativa:
Was I playing football yesterday?
Were we playing videogames last night?
Was she playing chess last night?
Were they studying English yesterday?
Were we learning English last year?