they sometimes still can be made 
(ROOT (S (NP (PRP they)) (ADVP (RB sometimes)) (ADVP (RB still)) (VP (MD can) (VP (VB be) (VP (VBN made))))))
(ROOT (S (NP (PRP )) (ADVP (RB )) (ADVP (RB )) (VP (MD ) (VP (VB ) (VP (VBN ))))))