Analyzing the Logic of Syllogisms
3. Some sticky substances are yucky things.
All taffy is a sticky substance.
Therefore, some taffy is a yucky thing.
4. All items made of gold are expensive items.
Some rings are items made of gold.
Therefore, some rings are expensive items.
5. All flies are winged creatures.
All butterflies are winged creatures.
Therefore, all butterflies are flies.
...e one of those. So some kinds of taffy MIGHT be yucky things, but there's nothing that says they HAVE to be. All taffy COULD go in the not-yucky category. So this one is not valid.
As for the second one, it tells us that anything made of gold is expensive. The second ...