Problem: Is "Billy is so short." true if "John couldn't see the stage with Billy in front of him because he is so short."?
Answer: no

Problem: Is "Susan told her about it." true if "Susan knew that Ann's son had been in a car accident, so she told her about it."?
Answer: yes

Problem: Is "The juggler was very impressive." true if "John was jogging through the park when he saw a man juggling watermelons. He was very impressive."?
Answer: yes

Problem: Is "Men had the right to keep their sons working for them until the men were 21 years of age." true if "Men had the right to keep their sons working for them until they were 21 years of age."?
Answer:
no