Problem: If "Adam can't leave work here until Bob arrives to replace him. If Bob had left home for work on time, he would be gone by this time.", does it follow that "Bob would be gone by this time."?

Answer: no


Problem: If "The Dakota prairie lay so warm and bright under the shining sun that it did not seem possible that it had ever been swept by the winds and snows of that hard winter.", does it follow that "It did not seem possible that the prairie had ever been swept by the winds and snows of that hard winter."?

Answer: yes


Problem: If "Everyone really loved the oatmeal cookies; only a few people liked the chocolate chip cookies. Next time, we should make more of them.", does it follow that "We should make more of the oatmeal cookies."?

Answer: yes


Problem: If "The sack of potatoes had been placed above the bag of flour, so it had to be moved first.", does it follow that "The sack of potatoes had to be moved first."?

Answer:
yes