Interested I B Opinion Coming Gym Good Tennis

"Since when have you been interested in my opinion?"
"Since when have you been coming to this gym?"
"Since when did you become so good at tennis?"

A. "I will have to go home soon, I have chess club tonight."
B. "Since when did you become so interested in chess?"
A. "I tried it with my uncle and loved it."
B. "Well, we'll have to play soon, I like playing too!"

Other Common Sentences

"From then until now."