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)))) (. ?)))
The Indians ancestors likely traveled in groups of 100 over the Aleutian land bridge. 
( ( The ( Indians ancestors ) ) ( likely ( ( ( traveled ( in ( groups ( of 100 ) ) ) ) ( over ( the ( Aleutian ( land bridge ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNPS Indians) (NNS ancestors)) (ADVP (RB likely)) (VP (VBD traveled) (PP (IN in) (NP (NP (NNS groups)) (PP (IN of) (NP (CD 100))))) (PP (IN over) (NP (DT the) (NNP Aleutian) (NN land) (NN bridge)))) (. .)))