Вопросы по past continuous отрицательный вопросы

Вот несколько примеров отрицательных вопросов в Past Continuous:

1. Wasn't she studying when you called her?
2. Weren't they playing football in the park yesterday?
3. Weren't you sleeping when the alarm went off?
4. Wasn't he working late last night?
5. Weren't we talking about this yesterday?

Здесь используется модальный глагол "wasn't" или "weren't" в сочетании с подлежащим и глаголом в форме причастия настоящего времени (-ing).