YOU SAID:
I'm not sure I fully understand this concept
INTO JAPANESE
この概念を完全に理解しているかどうかはわかりません
BACK INTO ENGLISH
I don't know if I fully understand this concept
INTO JAPANESE
この概念を完全に理解しているかどうかはわかりません
BACK INTO ENGLISH
I don't know if I fully understand this concept
You've done this before, haven't you.