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

Are "it" and "The sack of potatoes" the same?
Answer: yes

Problem: Bill passed the gameboy to John because *his* turn was next.

Are "his" and "Bill" the same?
Answer: no

Problem: Fred and Alice had very warm down coats , but *they* were not enough for the cold in Alaska.

Are "they" and "Fred and Alice" the same?
Answer: no

Problem: Tom threw his schoolbag down to Ray after *he* reached the bottom of the stairs.

Are "he" and "Ray" the same?
Answer:
yes