He was standing in front of a grey backdrop- somewhere that could be anywhere.
( ( ( ( He ( was ( standing ( in ( front ( of ( a ( grey backdrop ) ) ) ) ) ) ) ) - ) ( ( somewhere that ) ( could ( be anywhere ) ) ) ) . )
(ROOT (S (S (NP (PRP He)) (VP (VBD was) (VP (VBG standing) (PP (IN in) (NP (NP (NN front)) (PP (IN of) (NP (DT a) (JJ grey) (NN backdrop)))))))) (: -) (S (NP (RB somewhere) (WDT that)) (VP (MD could) (VP (VB be) (ADVP (RB anywhere))))) (. .)))
You couldn't tell where he was because he was in front of a backdrop.
( You ( ( ( could n't ) ( tell ( where ( he ( was ( because ( he ( was ( in ( front ( of ( a backdrop ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD could) (RB n't) (VP (VB tell) (SBAR (WHADVP (WRB where)) (S (NP (PRP he)) (VP (VBD was) (SBAR (IN because) (S (NP (PRP he)) (VP (VBD was) (PP (IN in) (NP (NP (NN front)) (PP (IN of) (NP (DT a) (NN backdrop))))))))))))) (. .)))