Are you reading things?
( ( ( Are you ) ( reading things ) ) ? )
(ROOT (SQ (VBP Are) (NP (PRP you)) (VP (VBG reading) (NP (NNS things))) (. ?)))
Are you reading?
( ( ( Are you ) reading ) ? )
(ROOT (SQ (VBP Are) (NP (PRP you)) (VP (VBG reading)) (. ?)))