( Fish ( will ( be ( unable ( to ( maintain buoyancy ) ) ) ) ) )
(ROOT (S (NP (NN Fish)) (VP (MD will) (VP (VB be) (ADJP (JJ unable) (S (VP (TO to) (VP (VB maintain) (ADVP (RB buoyancy))))))))))
Fish will be unable to maintain buoyancy
(ROOT (S (NP (NNS Continents)) (VP (VBP are) (ADJP (JJ unable) (S (VP (TO to) (VP (VB be) (VP (VBN pushed) (PRT (RP down)) (PP (IN into) (NP (DT the) (NN mantle))) (PP (IN by) (NP (NP (NN plate) (NNS boundaries)) (PP (RB because) (IN of) (NP (NN buoyancy))))))))))) (. .)))