After the police had tried unsuccessfully to who the car belonged they towed it into the station
→ Sai: to who the
Sửa: After the police had tried unsuccessfully to determine to whom the car belonged they towed it into the station
Giải thích: Vì ta cần một đại từ quan hệ thay thế cho chủ từ đóng vai trò là tân ngữ trong câu