['he', 'sacrifice', 'himself', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'contribute-13.2', '<PRP>', 'EmptyParameter', 'EmptyParameter']
Though he is willing to sacrifice himself to protect his crew.
though <PRP> is Synset('willing.a.01') to sacrifice <PRP> to protect <PRP> Synset('organization.n.01').