Problem: George got free tickets to the play, but he gave them to Eric , even though *he* was particularly eager to see it.

Do "he" and "Eric" mean the same thing?

Answer: no


Problem: This book introduced Shakespeare to Goethe ; it was a major influence on *his* writing.

Do "his" and "Goethe" mean the same thing?

Answer: yes


Problem: The sack of potatoes had been placed below the bag of flour , so *it* had to be moved first.

Do "it" and "the bag of flour" mean the same thing?

Answer:
yes