good in / at badminton

The standard construction is "to be good at". This is what I'd cling to.

Vincent TeoCan I say,

(a) He is good at / in badminton.

I've tried to come up with enough examples using 'at' or 'in', in order to make some sort of generalization about when we use which. I've failed

Hey Philip,

I'd always use at, you know. It seems the less you know, the less problems you have (applied to me in this case).

RuslanaHey Philip,

I'd always use at, you know. It seems the less you know, the less problems you have (applied to me in this case).

Hello beautiful Ruslana and sevgili arkadasim Philip,

I am making up a reason : When there is an action we c

DollHello beautiful Ruslana and sevgili arkadasim Philip,

I am making up a reason

For example, there is action in doing sport but not in math. In fact, I ment physical and mental (like you) Anyway, I just made up something but it didn't work out.