8.3.5 La negación en el present perfect

  I have already baked the cake.  
Have you ever been to London?  
  She has worked here for 20 years.  
  We have just opened a bottle of wine.  
  Have you seen Alex lately?  
  They have never been to Australia.  
  I have not closed the door yet.
  He has worked a lot recently.
  She has lived here since 1980.

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