Beginner with PluralizationServices

Sometime we want to change a word from singular to plural or backward. .NET is a powerful framework provide for our a class call PluralizationServices, so it make we can easy to do it.
Today, I show you some beginner example and some issues I miss when I try to use it. You can find more information in MSDN: http://msdn.microsoft.com/en-us/library/system.data.entity.design.pluralizationservices.pluralizationservice.aspx

For the first, I show you steps to make an example.
 - Create a new C# Console Application project (* Note: you need make .NET Framework 4 or later).
 - After create done, in solution explorer, right click on project name and choose Properties. In Application tab, make sure Target Framework is .NET Framework 4 (is not .NET Framework Client Profile). It is an issue make me waste many time on Google because I can not add reference for project.
 - Next, we add reference, right click on project name, select Add Reference..., in .NET tab, add System.Data.Entity.Design
 - Ok, now write this code:

   1:  using System;

   2:  using System.Data.Entity.Design.PluralizationServices;

   3:  using System.Globalization;

   4:   

   5:  namespace ConsoleApplication1

   6:  {

   7:      internal class Program

   8:      {

   9:          public static string SwitchPluralAndSingular(string word)

  10:          {

  11:              PluralizationService ps = PluralizationService.CreateService(CultureInfo.GetCultureInfo("en-us"));

  12:   

  13:              if (ps.IsPlural(word))

  14:              {

  15:                  return ps.Singularize(word);

  16:              }

  17:              if (ps.IsSingular(word))

  18:              {

  19:                  return ps.Pluralize(word);

  20:              }

  21:   

  22:              return word;

  23:          }

  24:   

  25:          private static void Main(string[] args)

  26:          {

  27:              Console.WriteLine(Program.SwitchPluralAndSingular("Word"));

  28:              Console.WriteLine(Program.SwitchPluralAndSingular("Words"));

  29:              Console.WriteLine(Program.SwitchPluralAndSingular("Child"));

  30:              Console.WriteLine(Program.SwitchPluralAndSingular("Children"));

  31:              Console.WriteLine(Program.SwitchPluralAndSingular("abc"));

  32:              Console.WriteLine(Program.SwitchPluralAndSingular("123"));

  33:              Console.ReadKey(true);

  34:          }

  35:      }

  36:  }

Can you done it?
Enjoy it!
* Update:
You can custom translated words by using:

   1:          private static PluralizationService IntializePluralization()

   2:          {

   3:              var ps = PluralizationService.CreateService(CultureInfo.GetCultureInfo("en-us"));

   4:              ((ICustomPluralizationMapping)ps).AddWord("Die", "Dies");

   5:              ((ICustomPluralizationMapping)ps).AddWord("Range", "Ranges");

   6:              return ps;

   7:          }

:)