I first determine that “1” and “3” are A propositions, while “2” and “4” are E’s. Then I recall that by opposition an I may be derived from an A and an O from an E. Hence, the inferences are:
(1) “Some good men are wise.”
(2) “Some teachers cannot afford to be unjust.”
(3) “Some birds fly.”
(4) “Some of the inner planets are not so large as the earth.”
(3b) Derive by opposition inferences from the following:
(1) “No true woman will neglect her home for society.”
(2) “All patriotic men love the flag.”
(3) “Fools rush in where angels fear to tread.”
(4a) Obvert the following: