It is unlikely that Bernhard is a swan. It is highly likely that Lily is a frog. It is probable that Sandra took the football.
We believe that either Bernhard is a swan, or Lily is a frog.
We believe that either Bernhard is a swan, or Lily is a frog.
It is impossible that either Bernhard is a swan, or Lily is a frog.
Either Bernhard is a swan, or Lily is a frog.