Were they playing football last Monday at 4:00? Общий
They were playing football last Monday at 4:00,weren't they? Разделительный
Who was playing football last Monday at 4:00? Вопрос к подлежащему
When were they playing football ? Специальный
Were they playing football or hockey last Monday at 4:00? Альтернативный
What were they doing last Monday at 4:00? Специальный вопрос к сказуемому
What game were they playing last Monday at 4:00? Специальный вопрос к дополнению
At what time were they playing football last Monday? Специальный вопрос к обстоятельству времени