( Antarctica ( ( was ( ( one ( of ( only ( two continents ) ) ) ) ( that ( were left ) ) ) ) . ) )
(ROOT (S (NP (NNP Antarctica)) (VP (VBD was) (NP (NP (CD one)) (PP (IN of) (NP (RB only) (CD two) (NNS continents))) (SBAR (WHNP (WDT that)) (S (VP (VBD were) (VP (VBN left))))))) (. .)))
Antarctica was one of only two continents that were left.
(ROOT (S (NP (NNP Antarctica)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN continent)) (PP (IN without) (NP (NNS amphibians))))) (. .)))