Chances are about even that John went to the hallway. It is impossible that Mary left the milk. It is probably not the case that Greg is green.
Chances are slight that greg is green, or John went to the hallway.
There is a better than even chance that greg is green, or John went to the hallway.
Chances are slight that greg is green, or John went to the hallway.
Greg is green, or John went to the hallway.