Вопросительная и отрицательная формы Past Continuous

В вопросе was или were ставится перед подлежащим: Were they waiting? В отрицании not идёт после формы be: She was not listening. Глагол на -ing остаётся во всех типах предложения.

• Was the dog sleeping then? — Собака тогда спала?
• I was not looking at my phone. — Я не смотрел на телефон.

Частая ошибка. Не вставляйте did: Were you working?, не Did you working?