YOU SAID:
I pooped in the bus on monday
INTO JAPANESE
私は月曜日にバスの中でうんちをした
BACK INTO ENGLISH
I pooped on the bus on Monday.
INTO JAPANESE
私は月曜日にバスにうんちをした。
BACK INTO ENGLISH
I pooped on the bus on Monday.
That didn't even make that much sense in English.