YOU SAID:
I bet you didn't know that already
INTO JAPANESE
私はあなたがすでにそれを知らなかったと思う
BACK INTO ENGLISH
I think you already did not know it
INTO JAPANESE
私はあなたがすでにそれを知らなかったと思う
BACK INTO ENGLISH
I think you already did not know it
That didn't even make that much sense in English.