YOU SAID:
I once saw a pig porking a dog
INTO JAPANESE
私は一度豚が犬を殺しているのを見たことがある
BACK INTO ENGLISH
I once saw a pig kill a dog
INTO JAPANESE
豚が犬を殺すのを一度見たことがある
BACK INTO ENGLISH
I once saw a pig kill a dog
That didn't even make that much sense in English.