Problem: Bob paid for Charlie 's college education. *He* is very grateful.

Are "He" and "Bob" the same?
Answer: no

Problem: Mark was close to Mr. Singer 's heels. He heard him calling for the captain , promising him, in the jargon everyone talked that night, that not one thing should be damaged on the ship except only the ammunition, but the captain and all *his* crew had best stay in the cabin until the work was over.

Are "his" and "the captain" the same?
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.

Are "it" and "sweater" the same?
Answer: no

Problem: Joan made sure to thank Susan for all the help *she* had given.

Are "she" and "Susan" the same?
Answer:
yes