Question:
Based on the premise "Fado songs, accompanied by classical guitar, generally deal with the hardships of seafaring life.", can we conclude that "Naval life is the primary topic of fado music."?
****
Answer:
yes

Question:
Based on the premise "Planning, engineering, installation, and start-up of an ACI system is only about 15 months and could be done in much less time if administrative matters, such as permitting, occur more quickly than assumed.", can we conclude that "There is no chance of getting the ACI started up in the 15 month timeframe if there is no greasing of the wheels for admin tasks. "?
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Answer:
no

Question:
Based on the premise "He swung down hard.", can we conclude that "Yesterday, he swung down hard."?
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Answer:
it is not possible to tell