YOU SAID:
so tell me what your best friend knows that I don't know
INTO JAPANESE
あなたの親友が私が知らないことを知っていることを教えてください
BACK INTO ENGLISH
Tell me that your best friend knows what I don't know
INTO JAPANESE
あなたの親友は私が知らないことを知っていると教えてください
BACK INTO ENGLISH
Tell me that your best friend knows what I don't know
Okay, I get it, you like Translation Party.