['they', 'develop', 'travel', 'EmptyParameter', 'EmptyParameter'] ['they', 'travel', 'EmptyParameter', 'past', 'to']
['<PRP>', 'appear-48.1.1', "Synset('change.n.03')", 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'run-51.3.2', 'EmptyParameter', '<DATE>6', 'to']
They have not developed time travel yet, although they obviously traveled to the past because their technology is more advanced than that of the 20th century.
<PRP> have not developed Synset('abstraction.n.06') Synset('change.n.03') yet, although <PRP> obviously traveled to <DATE>6 because <PRP> Synset('use.n.01') is more advanced than that of <DATE>6 <DATE>7.