A few rock musicians are weird people. No vampires give at the office. Every elf drinks stout. Critical thinking students are especially prone to psychosis. Some advertisers are not sneaky people.
Some young children are barbarians.
Every Bach organ concerto is sublime. Not a single vampire owns stock in a silver mine. Some of the snakes were not recaptured. Test the following pairs of propositions for equivalence of meaning. Some tired and stressed out people are not non-students.