YOU SAID:
As I was walking down the street, I saw a house on fire.
INTO JAPANESE
通りを歩いていると、火のついた家が見えました。
BACK INTO ENGLISH
As I was walking down the street, I saw a house with fire.
INTO JAPANESE
通りを歩いていると、火のある家が見えました。
BACK INTO ENGLISH
As I was walking down the street, I saw a house with fire.
That didn't even make that much sense in English.