Problem: In the storm, the tree fell down and crashed through the roof of my house. Now, I have to get *it* repaired.

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

Problem: Mark told Pete many lies about himself, which Pete included in his book. *He* should have been more skeptical.

Are "He" and "Pete" the same?
Answer: yes

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

Are "them" and "the chickens" the same?
Answer: yes

Problem: Our mistress hired a room for my crippled sister Nelly , and she gave her knitting and needlework when she was able to do it, and when *she* was ill she sent her dinners and many nice comfortable things and was like a mother to her.

Are "she" and "mistress" the same?
Answer:
no