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