You are correct. " US President John F. "
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Paco2004I think Kennedy's one sounds relatively natural because it is intepreted to be in the contrastive construct of <not .... but ...>. The full text is "Ask not what your country can do for you; ask what you can do for your country". Here the semicolon would be taken as a substitute for "but". "Ask not what your country can do for you, but ask what you can do fo