There is a very good chance that Bernhard is a swan. Chances are about even that Mary went to the garden. There is a very good chance that Brian is a frog.
It is highly likely that mary went to the garden, or Bernhard is a swan.
It is highly likely that mary went to the garden, or Bernhard is a swan.
It is probably not the case that mary went to the garden, or Bernhard is a swan.
Mary went to the garden, or Bernhard is a swan.