Problem: If "I can't cut that tree down with that axe; it is too thick.", does it follow that "The axe is too thick."?

Answer: no


Problem: If "Fred watched TV while George went out to buy groceries. After an hour he got up.", does it follow that "Fred got up."?

Answer: yes


Problem: If "The customer walked into the bank and stabbed one of the tellers. He was immediately taken to the police station.", does it follow that "The teller was immediately taken to the police station."?

Answer: no


Problem: If "By rolling over in her upper berth, Tatyana could look over the edge of it and see her mother plainly. How very small and straight and rigid she lay in the bunk below! Her eyes were closed, but Tatyana doubted if she slept.", does it follow that "Tatyana doubted if her mother slept."?

Answer:
yes