Past Progressive (Continuous)
Para formá-lo, use was (I, he, she, it), were (you, we, they) + a forma de ing do verbo principal (was doing, were sleeping).
O uso mais frequente do past continuous é descrever um fato que estava acontecendo quando um outro fato ocorreu.
Exemplos:
The phone was ringing when I came into the office.
I was having dinner out when I got the good news of my promotion.
The workers were digging the ground when the explosion happened.
Um outro uso frequente do past progressive é descrever duas ações que, simultaneamente, estavam ocorrendo.
Exemplo:
While my mom was fixing breakfast, I was making the beds.