Скласти 3 речення на Past Perfect  і зробити до них питальну форму.Спасибі!!!

She had finished dressing by 3 o`clock. Had she finished dressing by 3 o`clock? They had done their homework before they went to the park. When had they done their homework? When I arrived at the station, the train had left. Had the train left, when I arrived at the station?