If the premise has shading on part of the S circle, check whether it represents something that exists. If it does not, stop. The argument is invalid because it commits the existential fallacy. If your stamp of approval didn't make your argument valid, stop. It is invalid under any interpretation.
All electric motors are machines that depend on magnetism.
No tax audits are pleasant experiences for cheaters. Some people who attend Grateful Dead concerts are people who don't use drugs. Some people who listen to Henry Rawlins' CDs are not violent people. It's false that some birds are fish. All Vulcans are good logicians.