Вопросительные предложения в Past Continuous образуются путем переноса вспомогательного глагола was / were в начало предложения.

     Was / were + I / He / She / It / You / We / They + Ving

Was I drinking tea? — Я пил чай?

Were we driving the main road? — Мы ехали по главной дороге?

Was Arnold reading the book? — Арнольд читал книгу?

Were you eating breakfast? — Ты ел завтрак?