What kind of stories?
( ( What kind ) ( ( of stories ) ? ) )
(ROOT (FRAG (WHNP (WDT What) (NN kind)) (PP (IN of) (NP (NNS stories))) (. ?)))
What type of stories do you want to hear?
( ( ( What type ) ( of stories ) ) ( ( ( do you ) ( want ( to hear ) ) ) ? ) )
(ROOT (SBARQ (WHNP (WHNP (WDT What) (NN type)) (PP (IN of) (NP (NNS stories)))) (SQ (VBP do) (NP (PRP you)) (VP (VB want) (S (VP (TO to) (VP (VB hear)))))) (. ?)))