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Present Perfect  

The present perfect is formed with the verb have and a past participle. It is another way of expressing the past.

  He has studied English and French.  
  I have read many books.  

Many verbs have irregular past participles.

be
  been
did
  done
go
  gone
speak
  spoken
come
come
give
given
run
run
drink
drunk
fly
  flown
eat
  eaten
see
  seen
show
  shown
know
  known
forgot
forgotten
begin
  begun
write
  written
wear
  worn
fall
  fallen
take
  taken
wake
waken
break
  broken
awake
  awaken
got
  gotten      
  She has forgotten her name. She has amnesia.  
  I have already drunk the coffee.  
  They have gone to the mall.  
  She has come to see you.  

When have is used in the present progressive, it can be contracted with the preceding pronoun.

  I've been in New York before.  
  He's gone to the market.  
  We've come to see the president.  

The present progressive is negated with not. When not is present, have can be contracted with not but it can't be contracted with the preceding pronoun.

  She hasn't spoken to him.  
  We've not spoken with her.  

To ask a question, have is brought to the front of the sentence.

  Have you seen Matthew?  
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