Problem: Sam pulled up a chair to the piano , but *it* was broken, so he had to sing instead.

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

Answer: yes

Problem: Emma did not pass the ball to Janie although *she* saw that she was open.

Do "she" and "Emma" mean the same thing?

Answer: yes

Problem: The firemen arrived before the police because *they* were coming from so far away.

Do "they" and "The firemen" mean the same thing?

Answer:
no