Consider:
Every student is human.
Every student can read.
It does not follow that every human can read. Some humans may be outside the student class and unable to read. The premises tell us only that the two predicates meet in the student class.
In the third figure, a shared subject connects two predicates. With relevant instances, it can establish a particular overlap, not a universal rule for either wider class.
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Conjunctive Syllogisms with Conditional Propositions
Consider:
Every student is human.
Every student can read.
It does not follow that every human can read. Some humans may be outside the student class and unable to read. The premises tell us only that the two predicates meet in the student class.
In the third figure, a shared subject connects two predicates. With relevant instances, it can establish a particular overlap, not a universal rule for either wider class.