YOU SAID:
It was the first time he had ever seen someone cook dinner on an elephant!
INTO JAPANESE
誰かが象で夕食を作るのを見たのは初めてでした!
BACK INTO ENGLISH
It was the first time I saw someone cook dinner with an elephant!
INTO JAPANESE
誰かが象と一緒に夕食を作るのを見たのは初めてでした!
BACK INTO ENGLISH
It was the first time I saw someone cook dinner with an elephant!
That didn't even make that much sense in English.