YOU SAID:

That's just all he know, he don't know nothin' else

INTO JAPANESE

それだけで彼は知っている、彼は他の人を知らない

BACK INTO ENGLISH

That alone, he knows, he does not know other people

INTO JAPANESE

それだけで、彼は知っています、彼は他の人を知りません

BACK INTO ENGLISH

That alone, he knows, he does not know other people