Premise: A black Labrador retriever in a grassy field returns with a white nubby cylinder in its mouth .
Correct statement: Chances are about even that a black lab fetches a bone thrown by his owner
Incorrect statement: It is certain that a black lab fetches a bone thrown by his owner
Correct statement: It is probably the case that labrador Retrievers are energetic dogs that will play catch for hours .
Incorrect statement: It is unlikely that labrador Retrievers are energetic dogs that will play catch for hours .
Correct statement: It is impossible that the dog has retrieved the reactor core .
Incorrect statement: It is likely that the dog has retrieved the reactor core .
Correct statement: We believe that a dog is practicing retrieving with it 's master .
Incorrect statement: It is highly unlikely that a dog is practicing retrieving with it 's master .
Correct statement: It is probably not the case that a dog retrieves his favorite toy .
Incorrect statement: We believe that a dog retrieves his favorite toy .