Original: Some students are athletes.
Converse: Some athletes are students.
Imagine Ali belongs to both groups. In the original he is a student who is an athlete; in the converse he is an athlete who is a student. The same individual establishes both claims.
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Another particular affirmative example
Simple Conversion of Propositions: Definition, Method and Rules
Original: Some students are athletes.
Converse: Some athletes are students.
Imagine Ali belongs to both groups. In the original he is a student who is an athlete; in the converse he is an athlete who is a student. The same individual establishes both claims.