['they', 'begin', 'work', 'EmptyParameter', 'EmptyParameter'] ['they', 'work', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'begin-55.1', 'work-73.2', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'work-73.2', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
They begin to work.
<PRP> begin to work.