My mother was interested in world dancing.
Общий: Was my mother interested in world dancing?
Альтернативный: Was my mother or father interested in world dancing?
Вопрос к подлежащему: Who was interested in world dancing?
Разделительный: My mother was interested in world dancing, wasn't she?
Специальный: What was my mother interested in?
My mother was interested in world dancing.
Общий: Was my mother interested in world dancing?
Альтернативный: Was my mother or father interested in world dancing?
Вопрос к подлежащему: Who was interested in world dancing?
Разделительный: My mother was interested in world dancing, wasn't she?
Специальный: What was my mother interested in?