It is highly unlikely that Greg is a swan. It is highly likely that Mary went to the kitchen. We doubt that Julius is a frog.
It is probably not the case that julius is a frog, or Mary went to the kitchen.
It is highly likely that julius is a frog, or Mary went to the kitchen.
It is probably not the case that julius is a frog, or Mary went to the kitchen.
Julius is a frog, or Mary went to the kitchen.