All dolls are pens. Some ducks are dolls. Some dogs are ducks. Which conclusions follow?

Read the following statements: Some pearls are jewels. Some jewels are ornaments. Conclusions: I. Some jewels are pearls. II. Some ornaments are jewels.

Some pastries are toffees. All toffees are chocolates. Conclusions: I. Some chocolates are toffees. II. Some toffees are not pastries.

Statements: All rivers are ponds. Some waterfalls are ponds. All ponds are oceans. Which inference follows?

Statements: Some teachers are students. All students are girls. Which inferences follow?

Read the following statements: All Z are Y. Some Y are B. Conclusions: I. Some B are not Z. II. Some Y are not Z. III. Some Z are Y. Select the correct answer.