YOU SAID:
i killed my mom at the cookie exchange
INTO JAPANESE
クッキー交換でお母さんを殺した
BACK INTO ENGLISH
Killed mom by exchanging cookies
INTO JAPANESE
クッキーを交換してお母さんを殺した
BACK INTO ENGLISH
I exchanged cookies and killed my mom
INTO JAPANESE
クッキーを交換してお母さんを殺しました
BACK INTO ENGLISH
I exchanged cookies and killed my mom
That didn't even make that much sense in English.