code: public function isSingular($word)
  	{
  		// Try the cache for a known inflection.
  		$inflection = $this->getCachedPlural($word);
  
  		if ($inflection !== false)
  		{
  			return true;
  		}
  
  		$pluralWord = $this->toPlural($word);
  
  		if ($pluralWord === false)
  		{
  			return false;
  		}
  
  		// Compute the inflection to cache the values, and compare.
  		return $this->toSingular($pluralWord) == $word;
  	}
docs: Checks if a word is in a singular form.
  
  @param   string  $word  The string input.
  
  @return  boolean  True if word is singular, false if not.
  
  @since   1.0