( some ( ( have ( sought ( refuge ( in ( the mountains ) ) ) ) ) . ) )
(ROOT (S (NP (DT some)) (VP (VBP have) (VP (VBN sought) (NP (NP (NN refuge)) (PP (IN in) (NP (DT the) (NNS mountains)))))) (. .)))
some have sought refuge in the mountains.
(ROOT (S (NP (NNS Scientists)) (VP (VBP know) (SBAR (IN that) (S (NP (DT some) (NNS mountains)) (VP (VBD were) (ADVP (RB once)) (PP (IN at) (NP (NP (DT the) (NN bottom)) (PP (IN of) (NP (DT an) (NN ocean))))) (SBAR (IN because) (S (NP (JJ marine) (NNS fossils)) (VP (VBP have) (VP (VBN been) (VP (VBN found) (PP (IN on) (NP (NP (DT the) (NNS peaks)) (PP (IN of) (NP (DT some) (NNS mountains)))))))))))))) (. .)))