Problem: The sculpture rolled off the shelf because *it* wasn't anchored.

Do "it" and "The sculpture" mean the same thing?

Answer: yes


Problem: The fish ate the worm . *It* was hungry.

Do "It" and "The fish" mean the same thing?

Answer: yes


Problem: I asked Dave to get me my sweater from the other side of the yacht . While he was gone, I rested my arm on the rail over there and suddenly *it* gave way.

Do "it" and "yacht" mean the same thing?

Answer:
no