- I'm good _____ playing tennis?
- I'm good _____ playing tennis. I play every Sunday with my family.
- I'm good _____ playing tennis. I play every Sunday with my family.
En resumen
I' m good at playing tennis. I play every Sunday with my family.
I' m good at playing tennis.
I play every Sunday with my family.
Probablemente ya que no especificaste muy bien en mi opinion deberias poner la palabra "with".