Problem: In the storm, the tree fell down and crashed through the roof of my house. Now, I have to get *it* removed.
Are "it" and "the roof" the same?
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Answer: no


Problem: Lionel is holding captive a scientist, Dr. Vardi , who has invented a device that turns animals invisible; Lionel plans to use it on Geoffrey and send *him* to steal nuclear material from an army vault.
Are "him" and "Lionel" the same?
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Answer: no


Problem: Carol believed that Rebecca suspected that *she* had stolen the watch.
Are "she" and "Rebecca" the same?
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Answer:
no