Q: The dog chased the cat , which ran up a tree. *It* waited at the bottom.
Are "the cat" and "It" the same?
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A: no


Q: Adam can't leave work here until Bob arrives to replace him. If Bob had left home for work on time, *he* would be gone by this time.
Are "Adam" and "he" the same?
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A: yes


Q: John hired *him* self out to Bill to take care of him .
Are "Bill" and "him" the same?
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A:
yes