Question:
Based on the premise "he was a teacher", can we conclude that "He worked as a teacher"?
****
Answer:
yes

Question:
Based on the premise "I know lawyers are always dreadfully careful.", can we conclude that "I don't know if lawyers are ever careful."?
****
Answer:
no

Question:
Based on the premise "we didn't have air conditioning in our house or anything", can we conclude that "There was no air conditioning or anything in our home."?
****
Answer:
yes