“Human is a species” talks about the universal concept human and is natural. “Zayd is human” talks about the individual Zayd and is singular. The same word can appear in different roles; classification follows the subject’s logical role.
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Natural and singular are not interchangeable
Propositions: Categorical and Conditional Forms
“Human is a species” talks about the universal concept human and is natural. “Zayd is human” talks about the individual Zayd and is singular. The same word can appear in different roles; classification follows the subject’s logical role.