Did the ancestors of the Indians really come from Asia over the Aleutian land bridge?
( ( ( Did ( ( the ancestors ) ( of ( the Indians ) ) ) ) ( really ( ( come ( from Asia ) ) ( over ( the ( Aleutian ( land bridge ) ) ) ) ) ) ) ? )
(ROOT (SQ (VBD Did) (NP (NP (DT the) (NNS ancestors)) (PP (IN of) (NP (DT the) (NNPS Indians)))) (VP (ADVP (RB really)) (VB come) (PP (IN from) (NP (NNP Asia))) (PP (IN over) (NP (DT the) (NNP Aleutian) (NN land) (NN bridge)))) (. ?)))
I wonder if the Indians ancestors actually came over the Aleutian land bridge? 
( I ( ( wonder ( if ( ( the ( Indians ancestors ) ) ( actually ( came ( over ( the ( Aleutian ( land bridge ) ) ) ) ) ) ) ) ) ? ) )
(ROOT (S (NP (PRP I)) (VP (VBP wonder) (SBAR (IN if) (S (NP (DT the) (NNPS Indians) (NNS ancestors)) (ADVP (RB actually)) (VP (VBD came) (PP (IN over) (NP (DT the) (NNP Aleutian) (NN land) (NN bridge))))))) (. ?)))