Problem: It is not easy to space buttonholes exactly the same distance apart, and it is very difficult to cut them precisely the right size . The tiniest slip of the scissors will make the hole too large, and even one thread uncut will leave *it* too small.
Are "it" and "slip" the same?
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Answer: no

Problem: Paul tried to call George on the phone, but *he* wasn't available.
Are "he" and "Paul" the same?
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Answer: no

Problem: Emma did not pass the ball to Janie although *she* saw that she was open.
Are "she" and "Emma" the same?
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Answer:
yes