title: Identifying if a sentence is positive or negative regarding a subject
body: <p>I am new to NLP and have a question.</p>
  <p>Given a set of sentences about waiting time at a hospital, for each sentences, I want to identify if it says the waiting time is long or short. Some examples are:</p>
  <ul>
  <li>&quot;The waiting time is very long&quot; -&gt; Long</li>
  <li>&quot;I waited for just a short period of time&quot; -&gt; Short</li>
  <li>&quot;They didn't make me wait for long&quot; -&gt; Short</li>
  <li>&quot;I wouldn't say the waiting time is long&quot; -&gt; Short</li>
  <li>...</li>
  </ul>
  <p>What would be a good way to approach this problem?
  Thank you very much!</p>