Ugh, I agree Athenian. Those letter ones were difficult to get my head around - I ended up talking through them changing the letters to 'Animals', 'Bald', 'Cats' and 'Dead'. Made for some interesting statements, anyway!
"All Animals that are not Dead are Bald things that are not Cats."
Oh, and some questions I found confusing were simple word meanings - Like if a statement was true that 'All things are A', would 'Some things are A' also be true? Yes, because some means any number. Or no, because some means less than all. Blah. O.o