I said to him, Why?
( I ( ( ( ( said ( to him ) ) , ) Why ) ? ) )
(ROOT (S (NP (PRP I)) (VP (VBD said) (PP (TO to) (NP (PRP him))) (, ,) (ADVP (WRB Why))) (. ?)))
I asked him, for what reason?
( I ( ( ( ( asked him ) , ) ( for ( what reason ) ) ) ? ) )
(ROOT (S (NP (PRP I)) (VP (VBD asked) (NP (PRP him)) (, ,) (PP (IN for) (NP (WDT what) (NN reason)))) (. ?)))