( ( Of ( the ( seven continents ) ) ) ( , ( only ( Antarctica ( ( is ( unable ( to ( produce pumpkins ) ) ) ) ; ) ) ) ) )
(ROOT (S (PP (IN Of) (NP (DT the) (CD seven) (NNS continents))) (, ,) (ADVP (RB only)) (NP (NNP Antarctica)) (VP (VBZ is) (ADJP (JJ unable) (S (VP (TO to) (VP (VB produce) (NP (NNS pumpkins))))))) (: ;)))
Of the seven continents, only Antarctica is unable to produce pumpkins;
(ROOT (S (NP (NNP Antarctica)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN continent)) (PP (IN without) (NP (NNS amphibians))))) (. .)))