YOU SAID:

i have 12 fingers and only 8 of them are mine

INTO JAPANESE

私は 12 本の指を持っているし、それらの唯一の 8 は私のもの

BACK INTO ENGLISH

I have 12 fingers and only 8 of them are mine.

INTO JAPANESE

私は 12 本の指を持って、それらの唯一の 8 は私のもの。

BACK INTO ENGLISH

I have 12 fingers, mine is only 8 of them.

INTO JAPANESE

私は 12 本の指を持って、私はそれらの 8 のみ。

BACK INTO ENGLISH

I have 12 fingers, I was only 8 of them.

INTO JAPANESE

私は 12 の指を持っている、私はそれらの 8 だけだった。

BACK INTO ENGLISH

I have 12 fingers, I was only 8 of them.