( ( Of ( ( ( the ( seven ( ( most ( commonly recognized ) ) continents ) ) ) , ) only ) ) ( ( ( Antarctica and ) Australia ) ( ( are ( completely ( separated ( from ( other continents ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN Of) (NP (NP (DT the) (CD seven) (ADJP (RBS most) (RB commonly) (VBN recognized)) (NNS continents)) (, ,) (ADVP (RB only)))) (NP (NNP Antarctica) (CC and) (NNP Australia)) (VP (VBP are) (ADJP (RB completely) (JJ separated) (PP (IN from) (NP (JJ other) (NNS continents))))) (. .)))
Of the seven most commonly recognized continents, only Antarctica and Australia are completely separated from other continents.
(ROOT (S (NP (NNP Antarctica)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN continent)) (PP (IN without) (NP (NNS amphibians))))) (. .)))