YOU SAID:

Mario once said to me that I was gonna pee

INTO JAPANESE

マリオはかつておしっこするつもりだった私に言った

BACK INTO ENGLISH

Mario said I was going to pee once

INTO JAPANESE

マリオはおしっこを 1 回するつもりだったと述べた

BACK INTO ENGLISH

Mario was going to pee once said

INTO JAPANESE

マリオはおしっこがかつて言ったつもりだった

BACK INTO ENGLISH

Mario was going to pee once said