YOU SAID:

Everything bad that can happen in a hotel, has happened.

INTO JAPANESE

ホテルで起こることができるすべての悪いことが起こった。

BACK INTO ENGLISH

All the bad things that can happen in the hotel happened.

INTO JAPANESE

ホテルで起こりうる悪いことがすべて起こった。

BACK INTO ENGLISH

All the bad things that could happen in the hotel happened.

INTO JAPANESE

ホテルで起こる可能性があるすべての悪いことが起こった。

BACK INTO ENGLISH

All the bad things that could happen in the hotel happened.