Question:
Based on the premise "George Bush didn't ask permission to invade Panama in 1989.", can we conclude that "Invasion of Panama broke the peace treaty."?
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Answer:
it is not possible to tell

Question:
Based on the premise "It would be a big mistake for Congress to respond to irate seniors by punishing the HMOs.", can we conclude that "The Congress must punish the HMOs and the seniors can't do anything about it."?
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Answer:
no

Question:
Based on the premise "Since yesterday afternoon.", can we conclude that "Since last year"?
****
Answer:
no