I was doing my homework yesterday at 3 o'clock. Вчера в 3 часа я делал домашнюю работу.
I was walking in the park with my dog yesterday at 6 o'clock.Вчера в 6 часов я гулял с собакой в парке.
I was watching TV yesterday evening at 8 o'clock. Вчера в 6 часов вечера я смотрел телевизор.