Составить вопросы (один общий, и два специальных предложения с каждым ) 1) they are playing tennis now 2) mary plays the guitar vary well

1. Are they playing tenntis?
What are they playing?
What are they doing?
Who is playing tennis?

2. Does Mary play the guitar very well?
What does Mary play very well?
How does Mary play the guitar?
Who plays the guitar very well?

1.They are playing tennis. Are they playing tennis? What are they playing? 
They play tennis well. How do they play tennis? 
2.Mary is studying. Is Mary studying? 
She usually studies late in the evening. When does she usually study? 
3.My parents are having dinner. Are my parents having dinner? What are my parents having? 
They always have dinner at home. Where do they always have dinner?