they do n't fit well together 
(ROOT (S (NP (PRP they)) (VP (VBP do) (RB n't) (VP (VB fit) (ADVP (RB well)) (ADVP (RB together))))))
(ROOT (S (NP (PRP )) (VP (VBP ) (RB ) (VP (VB ) (ADVP (RB )) (ADVP (RB ))))))