ca n't believe anyone would really buy this stuff . 
(ROOT (S (VP (MD ca) (RB n't) (VP (VB believe) (SBAR (S (NP (NN anyone)) (VP (MD would) (ADVP (RB really)) (VP (VB buy) (NP (DT this) (NN stuff)))))))) (. .)))
(ROOT (S (VP (MD ) (RB ) (VP (VB ) (SBAR (S (NP (NN )) (VP (MD ) (ADVP (RB )) (VP (VB ) (NP (DT ) (NN )))))))) (. )))