why , you may ask , why should you buy the movie milk when the tv cow is free ? 
(ROOT (SBARQ (WHADVP (WRB why)) (PRN (, ,) (S (NP (PRP you)) (VP (MD may) (VP (VB ask)))) (, ,)) (WHADVP (WRB why)) (SQ (MD should) (NP (PRP you)) (VP (VB buy) (NP (DT the) (NN movie) (NN milk)) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN tv) (NN cow)) (VP (VBZ is) (ADJP (JJ free))))))) (. ?)))
(ROOT (SBARQ (WHADVP (WRB )) (PRN (, ) (S (NP (PRP )) (VP (MD ) (VP (VB )))) (, )) (WHADVP (WRB )) (SQ (MD ) (NP (PRP )) (VP (VB ) (NP (DT ) (NN ) (NN )) (SBAR (WHADVP (WRB )) (S (NP (DT ) (NN ) (NN )) (VP (VBZ ) (ADJP (JJ ))))))) (. )))