Past continuous - Pasado simple en inglés

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AFIRMATIVA:
Sujeto + was / were + forma ing del verbo principal

He was walking
We were walking

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NEGATIVA:
Sujeto + was / were + not + forma ing del verbo principal

She was not walking
They were not walking

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INTERROGATIVA:
Was / Were + sujeto + forma ing del verbo principal

Was I walking?
Were you walking?

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El Past Continuous (pasado continuo) se emplea para describir una acción que estaba ocurriendo en un momento concreto del pasado. La acción comenzó antes de dicho momento y continuó después.

I was studying at 10 o'clock yesterday

También se emplea para acciones largas, resaltando que duraron mucho tiempo.

I was studying all day yesterday
He was talking on the phone for a long time

En este caso suele ir acompañado de expresiones temporales como all day, all night, the whole day, for a long time, during, etc.

Otro uso del pasado continuo es para acciones prolongadas que ocurrieron en el pasado al mismo tiempo.

While you were reading the paper, I was doing my homework

Con este uso va acompañado de las expresiones while, as o and.

La más larga de dos acciones, que fue interrumpida por una más breve que va en pasado simple.

I was singing a song when it began to rain
He was writing to me when he received my e-mail