(S (S (ADVP (RB Currently)) (COMMA ,) (S (BASENP (NNS pirates)) (VP (VBP are) (VP (VBN thought) (S (VP (TO to) (VP (VB be) (VP (VBG holding) (NP (BASENP (QP (RB about) (NN three) (NN hundred)) (NN crew) (NNS members)) (PP (IN from) (BASENP (JJ seventeen) (NNS ships)))))))))))) (PERIOD .))