Do you think I should be concerned?
( ( ( Do you ) ( think ( I ( should ( be concerned ) ) ) ) ) ? )
(ROOT (SQ (VBP Do) (NP (PRP you)) (VP (VB think) (SBAR (S (NP (PRP I)) (VP (MD should) (VP (VB be) (ADJP (JJ concerned))))))) (. ?)))
Do you think it is a problem?
( ( ( Do you ) ( think ( it ( is ( a problem ) ) ) ) ) ? )
(ROOT (SQ (VBP Do) (NP (PRP you)) (VP (VB think) (SBAR (S (NP (PRP it)) (VP (VBZ is) (NP (DT a) (NN problem)))))) (. ?)))