YOU SAID:

I'm not sure about this.

INTO JAPANESE

このことについて確信していません。

BACK INTO ENGLISH

Not so sure about this.

INTO JAPANESE

だから、これについては確認されません。

BACK INTO ENGLISH

So, not sure about this.

INTO JAPANESE

だから、これがわからない。

BACK INTO ENGLISH

So, don't know this.

INTO JAPANESE

これを知らない。

BACK INTO ENGLISH

Do not know this.

INTO JAPANESE

これを知っていません。

BACK INTO ENGLISH

It does not know.

INTO JAPANESE

それは知らない。

BACK INTO ENGLISH

I do not know it.

INTO JAPANESE

なんで

BACK INTO ENGLISH

I do not know

INTO JAPANESE

なんで

BACK INTO ENGLISH

I do not know