YOU SAID:
Do you know how I know that I know?
INTO JAPANESE
私が知っていることをどうやって知っているか知っていますか?
BACK INTO ENGLISH
Do you know how to know what I know?
INTO JAPANESE
私が知っていることを知る方法を知っていますか?
BACK INTO ENGLISH
Do you know how to know what I know?
You've done this before, haven't you.