YOU SAID:
Okay so I never knew she got with my sister.
INTO JAPANESE
わかりましたので、私は彼女が私の妹と一緒になったことを知りませんでした。
BACK INTO ENGLISH
Okay, so I didn't know that she was with my sister.
INTO JAPANESE
さて、それで私は彼女が私の妹と一緒にいたことを知りませんでした。
BACK INTO ENGLISH
Well, so I did not know that she was with my sister.
INTO JAPANESE
そう、私は彼女が私の妹と一緒にいたことを知りませんでした。
BACK INTO ENGLISH
Yes, I did not know that she was with my sister.
INTO JAPANESE
はい、私は彼女が私の妹と一緒にいたことを知りませんでした。
BACK INTO ENGLISH
Yes, I did not know that she was with my sister.
That didn't even make that much sense in English.