YOU SAID:

I just know that I don't really know that I don't know but, I know about the thing about the thing.

INTO JAPANESE

私はただ、自分が本当に知らないこと、知らないことだけは知っていますが、そのことについては知っています。

BACK INTO ENGLISH

I just know what I don't really know and don't know, but I know about it.

INTO JAPANESE

本当に知らないこと、知らないことだけを知っているだけです。

BACK INTO ENGLISH

I only know what I really don't know and what I don't know.

INTO JAPANESE

本当に知らないこと、知らないことしか知らない。

BACK INTO ENGLISH

I only know what I really don't know and what I don't know.