Помогите поставить вопросы

General: Can Mary play two musical instruments well? Tag question: Mary can play two musical instruments well, can't she? Special 1: How many musical instruments can Mary play well? Special 2: What musical instruments can Mary play well? Special 3: How well can Mary play two musical instruments?   Может быть, один из специальных вопросов должен быть к подлежащему? Who can play two musical instruments well?