Use Euler diagrams to check the validity of each argument.
a. Some men are teachers.
Sam Jones is a teacher.
Therefore, Sam Jones is a man.
b. Gold is heavy.
Nothing but gold will satisfy Amy.
Hence, nothing that is light will satisfy Amy.
c. No cats are dogs.
All poodles are dogs.
So some poodles are not cats.
d. Some cows eat hay.
All horses eat hay.
Only cows and horses eat hay.
Frank eats hay, so Frank is a horse.
e. All chimpanzees are monkeys.
All monkeys are animals.
Some animals have two legs.
So some chimpanzees have two legs.
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