YOU SAID:
I'm a potato and I know it
INTO JAPANESE
私はジャガイモだし、私はそれを知っている
BACK INTO ENGLISH
I'm a potato, and I know it
INTO JAPANESE
私はジャガイモです、そして私はそれを知っています
BACK INTO ENGLISH
I'm a potato, and I know it
That didn't even make that much sense in English.