(S (S (BASENP (NNP North) (NNP Sea) (NN oil) (NNS platforms)) (VP (VBP are) (VP (VBG being) (VP (VBN evacuated) (PP (IN in) (NP (BASENP (NN advance)) (PP (IN of) (BASENP (DT the) (NN storm))))))))) (PERIOD .))