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2Have you ever seen Nelsons Column 
  I have never seen it yet
3Have you ever watched animals in London Zoo
  I have just watched it
4Have you ever sent a letter to his parents
  I have already sent a letter them
5Have you ever bought some gifts for hid paarents
   I have just bought gifts them
6Have you ever fed birds on Trafalgar Squar
   I havent fed birds yet