Problem: John hired *him* self out to Bill to take care of him .
Are "him" and "John" the same?
****
Answer: no


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.
Are "it" and "rail" the same?
****
Answer: yes


Problem: The delivery truck zoomed by the school bus because *it* was going so slow.
Are "it" and "the school bus" the same?
****
Answer:
yes