title: Vim sentence motion
body: <p>According to Vim's manual:</p>
  <blockquote>
  <p>A sentence is defined as ending at a '.', '!' or '?' followed by either the end of a line, or by a space or tab.</p>
  </blockquote>
  <p>However <code>(</code> and <code>)</code> normal-mode motions seem to have no effect if there's only one space between sentences:</p>
  <pre><code>First sentence. Second sentence.
  </code></pre>
  <p>But <code>(</code> and <code>)</code> work as expected if there are multiple spaces between sentences:</p>
  <pre><code>First sentence.  Second sentence.
  </code></pre>
  <p>My question is why <code>(</code> and <code>)</code> have no effect when sentences are separated with a single space?</p>