Question:
Based on the premise "On one of the seven hills of ancient Rome, the fortress-like Palazzo del Quirinale, once summer residence to popes fleeing the malarial swamps of the Vatican down by the Tiber, housed the new king of Italy after 1870, and since 1947 is the presidential palace.", can we conclude that "The popes had the flee the malarial swamps of the Vatican so they would go to Rome."?
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Answer:
it is not possible to tell

Question:
Based on the premise "By the time he learned to use it, night had fallen, and he was too tired to try anything more.", can we conclude that "Night had fallen by the time he figured it out and was too tired to try anything else."?
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Answer:
yes

Question:
Based on the premise "It hurts to walk." ", can we conclude that "My leg is so messed up it hurts to walk."?
****
Answer:
it is not possible to tell