The question Which is correct? do they? or don't they? or have they or haven't they? was summarily closed for reasons that aren't clear to me. Personally, I don't think it's necessarily obvious that the "polarity" of an assertion is "reversed" by adverbial elements such as hardly, rarely, seldom,...

For example, I would like to write "Fred's going to the restaurant." Instead of "Fred is going to the restaurant." I understand that an apostrophe s after a proper noun conventionally denotes that proper noun's possession.