['they', 'have', 'return', 'EmptyParameter', 'EmptyParameter'] ['they', 'return', 'EmptyParameter', 'week', 'by']
['<PRP>', 'own-100', 'convert-26.6.2', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'convert-26.6.2', 'EmptyParameter', '<DURATION>1', 'by']
They had to return by two weeks.
<PRP> had to return by <DURATION>1.