Problem: The foxes are getting in at night and attacking the chickens . I shall have to kill *them* .
Are "them" and "The foxes" the same?
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Answer: yes


Problem: I sallied out for a bit of food , more to pass the time than because I wanted *it* .
Are "it" and "time" the same?
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Answer: no


Problem: The sculpture rolled off the shelf because *it* wasn't anchored.
Are "it" and "The sculpture" the same?
****
Answer:
yes