YOU SAID:
My mother was killed by something impossible until it became possible
INTO JAPANESE
私の母は、それが可能になるまで不可能な何かによって殺されました
BACK INTO ENGLISH
My mother was killed by something impossible until it was possible
INTO JAPANESE
私の母は、それが可能になるまで不可能な何かによって殺された
BACK INTO ENGLISH
My mother was killed by something impossible until it was possible
That didn't even make that much sense in English.