YOU SAID:

the only thing I know is that I know nothing

INTO JAPANESE

私が知っている唯一の事は何も知らない

BACK INTO ENGLISH

The only thing that I know don't know anything

INTO JAPANESE

僕がわからないのは　なぜかってことだ

BACK INTO ENGLISH

The only thing I don't know is why.

INTO JAPANESE

僕がわからないのは　なぜかってことだ

BACK INTO ENGLISH

The only thing I don't know is why.