YOU SAID:
I'll clean my room, I promise
INTO JAPANESE
私は約束私の部屋をきれいよ
BACK INTO ENGLISH
I promise to clean my room
INTO JAPANESE
私は自分の部屋を掃除しなければなりません。
BACK INTO ENGLISH
I have to clean my room.
INTO JAPANESE
私は自分の部屋を掃除しなければなりません。
BACK INTO ENGLISH
I have to clean my room.
That didn't even make that much sense in English.