Problem: If "Jane knocked on Susan's door, but there was no answer. She was out.", does it follow that "Susan was out."?

Answer: yes

Problem: If "Fred is the only man alive who still remembers my father as an infant. When Fred first saw my father, he was twelve months old.", does it follow that "When Fred first saw my father, My father was twelve months old."?

Answer: yes

Problem: If "The fish ate the worm. It was tasty.", does it follow that "The fish was tasty."?

Answer: no

Problem: If "Ann asked Mary what time the library closes, but she had forgotten.", does it follow that "Mary had forgotten."?

Answer:
yes