It is probably not the case that Mary put down the apple. There is almost no chance that Greg is a frog. It is impossible that Sandra got the apple.
It is probably not the case that sandra got the apple, or Mary put down the apple.
It is probably not the case that sandra got the apple, or Mary put down the apple.
It is likely that sandra got the apple, or Mary put down the apple.
Sandra got the apple, or Mary put down the apple.