Problem: Sam Goodman 's biography of the Spartan general Xenophanes conveys a vivid sense of the difficulties *he* faced in his childhood.

Are "he" and "Xenophanes" the same?
Answer: yes

Problem: John was doing research in the library when he heard a man humming and whistling. *He* was very annoyed.

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

Problem: Thomson visited Cooper 's grave in 1765. At that date *he* had been travelling for five years.

Are "he" and "Thomson" the same?
Answer: yes

Problem: The sun was covered by a thick cloud all morning, but luckily, by the time the picnic started, *it* was gone.

Are "it" and "The sun" the same?
Answer:
no