['they', 'begin', 'sing', 'EmptyParameter', 'EmptyParameter'] ['they', 'sing', 'EmptyParameter', 'duet', 'as']
['<PRP>', 'begin-55.1', 'manner_speaking-37.3', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'manner_speaking-37.3', 'EmptyParameter', "Synset('diversion.n.01')", 'as']
They begin to sing together as a duet.
<PRP> begin to sing together as a Synset('diversion.n.01').