Some teachers are not happy with their job. Some S are not P. At least one member of the subject category is excluded from the predicate category. Not all criminals are evil. Some mammals are not cats. Translate the following sentences into standard categorical form and state which of the four forms A, E, I, O you have used.
Every gecko is a lizard.
Not every lizard is a chameleon. Only reptiles can be lizards. Snakes are the only members of the suborder Ophidia. Snakes are not the only members of the animal kingdom. None of the burrowing snakes are poisonous.