Universal affirmative: Every human is an animal → Some animals are human.
Universal negative: No human is a stone → No stone is a human.
Particular affirmative: Some animals are human → Some humans are animals.
Particular negative: Some animals are not human ⇏ Some humans are not animals.
The first three have standard conversion rules; the fourth has none valid in general.
Opening interactive controls...
The four-rule map
Simple Conversion of Propositions: Definition, Method and Rules
Universal affirmative: Every human is an animal → Some animals are human.
Universal negative: No human is a stone → No stone is a human.
Particular affirmative: Some animals are human → Some humans are animals.
Particular negative: Some animals are not human ⇏ Some humans are not animals.
The first three have standard conversion rules; the fourth has none valid in general.