Chances are slight that Gertrude is a mouse. It is probably the case that Mary left the football. It is probably not the case that Lily is yellow.
It is probably not the case that mary left the football, or Lily is yellow.
There is a very good chance that mary left the football, or Lily is yellow.
It is probably not the case that mary left the football, or Lily is yellow.
Mary left the football, or Lily is yellow.