&gt; <i>Humans do a remarkable job of dealing with ambiguity, almost to the point where the problem is unnoticeable; the challenge is for computers to do the same. Multiple ambiguities such as these in longer sentences conspire to give a combinatorial explosion in the number of possible structures for a sentence.</i><p>Isn&#x27;t the core observation about natural language that humans <i>don&#x27;t parse it at all</i>? Grammar is a secondary, derived construct that we use to give language some stability; I doubt anyone reading &quot;Alice drove down the street in her car&quot; actually parsed the grammatical structure of that sentence, either explicitly or implicitly.<p>Anyway, some impressive results here.