YOU SAID:
i'm good at rubics cubing
INTO JAPANESE
私はrubicscubingが得意です
BACK INTO ENGLISH
I'm good at rubics cube
INTO JAPANESE
ルービックキューブが得意です
BACK INTO ENGLISH
I am good at Rubik's cube
INTO JAPANESE
ルービックキューブが得意です
BACK INTO ENGLISH
I am good at Rubik's cube
You've done this before, haven't you.