6 marks of a substance (1) Not predicable of a subject
We speak in a subject-predicate manner, so the subject is a substance or accident, and the predicate is something else of the object.
But in some cases, the substance cannot be in the predicate position. Example: Valid: "The T-shirt is red" ( Subject= T-shirt, which is the Substance) (Predicate= red, which is the accident)
Not Valid: "The T-shirt is a Kaitlyn" ( The Subject is T-shirt, which is a substance, and the predicate is Kaitlyn, which is also a substance, so it is NOT valid)