Question:
Based on the premise "I decided I could never be a prosecutor.", can we conclude that "I decided to become an airplane pilot instead."?
****
Answer:
it is not possible to tell

Question:
Based on the premise "My security clearance was shaky at best, but the guards knew who I was.", can we conclude that "The guards didn't know who I was."?
****
Answer:
no

Question:
Based on the premise "but she's she's usually pretty good", can we conclude that "She's usually doing well."?
****
Answer:
yes