['they', 'request', 'he', 'EmptyParameter', 'EmptyParameter'] ['he', 'sing', 'more', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'beg-58.2', '<PRP>', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'manner_speaking-37.3', 'more', 'EmptyParameter', 'EmptyParameter']
They request him to sing some more.
<PRP> request <PRP> to sing some more.