YOU SAID:

if i do not win i swear ill kill you

INTO JAPANESE

私が勝たないなら私は病気を誓うあなたを殺す

BACK INTO ENGLISH

If I do not win I swear I will kill you

INTO JAPANESE

私が勝たなければ私はあなたを殺すと誓う

BACK INTO ENGLISH

I swear I will kill you unless I win

INTO JAPANESE

私は勝たない限り私はあなたを殺すと誓う

BACK INTO ENGLISH

I swear I will kill you unless I win