(17) Illustrate the process known as negating the predicate.
(18) State the rule for obverting an A proposition.
(19) Obvert the following:
(1) “All the boys in my room are industrious.”
(2) “Honesty is the best policy.”
(3) “Only the industrious are truly successful.”
(20) First state the rule and then obvert the following:
(1) “Some plants are biennial.”
(2) “Planets are not suns.”
(3) “Blessed are the merciful.”