Therefore, some politicians are donkeys. Use the methods of Chapter 9 of your text to arrive at your answers. No shoes but loafers are sold in this store. The shoes sold here can be expensive. All loafers are sold in this store.
Some loafers are expensive.
No expensive loafers are sold in this store. Every successful mechanic uses cast-iron wrenches. Some mechanics use wrenches made of something besides cast iron. So some mechanics are not successful. All valid syllogisms are incapable of surprising you.