YOU SAID:
Could be that the black cat is waiting for something to happen.
INTO JAPANESE
黒猫が何かが起こるのを待っている可能性があります。
BACK INTO ENGLISH
The black cat may be waiting for something to happen.
INTO JAPANESE
黒猫は何かが起こるのを待っているかもしれません。
BACK INTO ENGLISH
The black cat may be waiting for something to happen.
That didn't even make that much sense in English.