We doubt that Bill went to the kitchen. It is highly likely that Gertrude is a cat. There is a better than even chance that Greg is white. It is impossible that if Gertrude is a cat, or Greg is white, then John left the apple. It is certain that if Greg is white, or Bill went to the kitchen, then Julius is a swan. It is probably the case that if either Gertrude is a cat, or Greg is white, then Mary moved to the garden.
We doubt that either Mary moved to the garden, or Greg is white.
There is a very good chance that either Mary moved to the garden, or Greg is white.
We doubt that either Mary moved to the garden, or Greg is white.
Either Mary moved to the garden, or Greg is white.