28. three forms of negation are given for each statement. which is correct? a. nobody is perfect. 1. everyone is imperfect. 2. everyone is perfect. 3. someone is perfect. b. all swimmers are tall. 1. some swimmer is not tall. 2. there are no tall swimmers. 3. every swimmer is short. c. every planet is cold and lifeless. 1. no planet is cold and lifeless. 2. some planet is not cold and not lifeless. 3. some planet is not cold or not lifeless. d. no bears are hungry. 1. only bears are hungy. 2. all bears are hungry. 3. there is a hungry bear.