( ( How long ) ( ( ( does it ) ( ( take ( for ( a ( Christmas tree ) ) ) ) ( to grow ) ) ) ? ) )
(ROOT (SBARQ (WHADJP (WRB How) (JJ long)) (SQ (VBZ does) (NP (PRP it)) (VP (VB take) (PP (IN for) (NP (DT a) (NNP Christmas) (NN tree))) (S (VP (TO to) (VP (VB grow)))))) (. ?)))
How long does it take for a Christmas tree to grow?
(ROOT (S (NP (NP (DT An) (NN acorn)) (VP (VBG growing) (PP (IN into) (NP (DT an) (JJ adult) (NN tree))))) (VP (MD will) (VP (VB take) (NP (DT the) (JJS longest) (NN time)) (S (VP (TO to) (VP (VB observe)))))) (. .)))