YOU SAID:
The floor and ceiling are mine.
INTO JAPANESE
床と天井は私です。
BACK INTO ENGLISH
I am a floor and a ceiling.
INTO JAPANESE
私は床と天井。
BACK INTO ENGLISH
I'm the floor and ceiling.
INTO JAPANESE
私は床と天井。
BACK INTO ENGLISH
I'm the floor and ceiling.
That didn't even make that much sense in English.