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2Have you ever seen Nelson's 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 haven't fed birds yet