do n't see often enough these days 
(ROOT (S (VP (VB do) (RB n't) (VP (VB see) (ADVP (RB often) (RB enough)) (NP (DT these) (NNS days))))))
(ROOT (S (VP (VB ) (RB ) (VP (VB ) (ADVP (RB ) (RB )) (NP (DT ) (NNS ))))))