Consider: “If every square has four sides, this particular square also has four sides.”
Antecedent: Every square has four sides.
Consequent: This particular square has four sides.
Relation: applying a universal fact to an instance known to fall under it.
Kind: an affirmative connective with an intelligible conceptual relation, on the specified assumption.
Four questions organize the analysis: What is the antecedent? What is the consequent? Is the link affirmed or denied? Is it necessary or coincidental? Only then can the proposition be classified reliably.