Chances are about even that Daniel left the football. There is almost no chance that Greg is a swan. It is probable that Fred went to the bedroom.
It is likely that either Fred went to the bedroom, or Greg is a swan.
It is likely that either Fred went to the bedroom, or Greg is a swan.
We doubt that either Fred went to the bedroom, or Greg is a swan.
Either Fred went to the bedroom, or Greg is a swan.