YOU SAID:
why u falling up de stairs
INTO JAPANESE
なぜ階段を降りるの?
BACK INTO ENGLISH
Why are you going down the stairs?
INTO JAPANESE
なぜ階段を降りていますか?
BACK INTO ENGLISH
Why are you getting off the stairs?
INTO JAPANESE
なぜ階段から降りていますか?
BACK INTO ENGLISH
Why are you getting off the stairs?
That didn't even make that much sense in English.