YOU SAID:

What I was talking about was that I didn't knew it.

INTO JAPANESE

私が話していたのは、私はそれを知らなかったということです。

BACK INTO ENGLISH

What I was talking about was that I did not know it.

INTO JAPANESE

私が話していたのは、私はそれを知らなかったということです。

BACK INTO ENGLISH

What I was talking about was that I did not know it.