Chapter 8 Practice

Chapter 8 Exercises

Translate the following into standard form:

1. Every salamander is a lizard.

2. Only reptiles can be lizards.

3. Snakes are the only members of the suborder Ophidia.

4. The only members of the suborder Ophidia are snakes.

5. None of the burrowing snakes are poisonous.

6. There are birds in the air.

7. Not all jokes are funny stories.

8. An animal is a canine if it is a wolf.

9. The only people allowed in the theater are people with tickets.

10. Only Catholics are popes.

11. Anything that’s an alligator is a reptile.

12. Anything that qualifies as a frog qualifies as an amphibian.

13. There are frogs wherever there are snakes.

14. Wherever there are snakes, there are frogs.

15. Whenever the frog population decreases, the snake population decreases.

16. Most home movies are as boring as dirt.

17. Socrates is a Greek.

18. If an automobile was built before 1950, it’s an antique.

19. None of my students are failing.

20. If you live in the dorms, you can’t own a car.

21. There are a few right-handed first basemen.

22. The only tests George fails are the ones he takes.

23. Roofers aren’t millionaires.

24. A few holidays fall on Saturday.

25. Rubies are red.

1. Find the contrapositive of “No Sunnis are Christians.”

2. Find the obverse of “Some Arabs are Christians.”

3. Find the obverse of “All Sunnis are Muslims.”

4. Find the converse of “Some Kurds are not Christians.”

5. Find the converse of “No Hindus are Muslims.”

6. Find the contrapositive of “Some Indians are not Hindus.”

7. Find the converse of “All Shiites are Muslims.”

8. Find the contrapositive of “All Catholics are Christians.”

9. Find the converse of “All Protestants are Christians.”

10. Find the obverse of “No Muslims are Christians.”

11. Find the obverse of “Some students who scored well on the exam are students who wrote poor essays.”

12. Find the obverse of “No students who wrote poor essays are students who were admitted to the program.”

13. Find the contrapositive of “Some students who were admitted to the program are not students who scored well on the exam.”

14. Find the contrapositive of “No students who did not score well on the exam are students who were admitted to the program.”

15. Find the contrapositive of “All students who were admitted to the program are students who wrote good essays.”

16. Find the obverse of “No students of mine are unregistered students.”

17. Find the obverse of “No first basemen are right-handed people.”