9. What was the problem with you, Mom ?
-> What is wrong with you, Mom?
->What is the matter with you, mom?
10. What is the problem with her, Lan ?
-> What is wrong with her, Lan?
->What is the matter with her, Lan?
11. My father swims skillfully.
->My father is a skilful swimmer.
12. She plays tennis badly.
-> She is a bad tennis player.