title: Determine if a sentence is an inquiry
body: <p>How can I detect if a search query is in the form of a question?</p>
  
  <p>For example, a customer might search for "how do I track my order" (notice no question mark).</p>
  
  <p>I'm guessing most direct questions would conform to a particular grammar.</p>
  
  <p>Very simple guessing approach:</p>
  
  <pre><code>START WORDS = [who, what, when, where, why, how, is, can, does, do]
  
  isQuestion(sentence):
    sentence ends with '?'
    OR sentence starts with one of START WORDS
  </code></pre>
  
  <p>START WORDS list could be longer. The scope is a website search box, so I imagine the list shouldn't need to include too many words.</p>
  
  <p>Is there a library that can do this better than my simple guessing approach? Any improvements on my approach?</p>