['worth', 'leave', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
["Synset('worth.n.03')", 'leave-51.2-1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
Two minutes worth of oxygen are left.
<DURATION>2 Synset('worth.n.03') of Synset('substance.n.01') are left.