Chances are slight that Sandra dropped the milk. It is almost certain that Lily is a swan. It is probably not the case that John went to the hallway.
It is probably the case that either Lily is a swan, or John went to the hallway.
It is probably the case that either Lily is a swan, or John went to the hallway.
We doubt that either Lily is a swan, or John went to the hallway.
Either Lily is a swan, or John went to the hallway.