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)))) (. ?)))
We all know that the Indians ancestors did not come from Asia. 
( We ( all ( ( know ( that ( ( the ( Indians ancestors ) ) ( ( did not ) ( come ( from Asia ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP We)) (ADVP (DT all)) (VP (VBP know) (SBAR (IN that) (S (NP (DT the) (NNPS Indians) (NNS ancestors)) (VP (VBD did) (RB not) (VP (VB come) (PP (IN from) (NP (NNP Asia)))))))) (. .)))