1.He was listening to music yesterday at 3:00
Was he listening to music yesterday at 3:00? - общий вопрос
He was listening to music yesterday at 3:00, wasn't he? - разделительный вопрос
Who was listening to music yesterday at 3:00? - специальный вопрос к подлежащему
When was he listening to music yesterday? - специальный вопрос
Was he listening to music or watching TV programme yesterday at 3:00? - альтернативный вопрос
2.Now he reads a book. - переделываем в Past Continuous - получается:
He was reading a book at this time last Monday.
He was reading a book at this time last Monday, wasn't he? - разделительный вопрос
Was he reading a book at this time last Monday?- общий вопрос
Who was reading a book at this time last Monday?- специальный вопрос к подлежащему
Was he reading a book at this time last Monday or Sunday? - альтернативный вопрос
What was he doing at this time last Monday? - специальный вопрос