Problem: No one joins Facebook to be sad and lonely. But a new study from the University of Wisconsin psychologist George Lincoln argues that that's exactly how *it* makes us feel.

Do "it" and "study" mean the same thing?

Answer: no

Problem: The foxes are getting in at night and attacking the chickens . I shall have to guard *them* .

Do "them" and "the chickens" mean the same thing?

Answer: yes

Problem: A man's life and a horse's life are worth more than some foxes' tails ; al least *they* ought to be.

Do "they" and "foxes' tails" mean the same thing?

Answer:
no