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Present perfect (Is a combination of the present tense and perfect aspect…

- - - - Subject + auxiliary verb (to
        have) + past participle ...
    - - I/you have [I've/you've]
        talked to Peter.
      - I/you have [I've/you've]
        talked to Peter.
      - We have [We've]
        been to London.
      - They have [They've]
        learned English.
  - - - Auxiliary verb (to have) + subject
        
        past participle ...?
    - - Has she/he gone to work?
      - Have we been
        to London?
      - Have they learned English?
      - Have i/you talked to Peter?
  - - - Subject + auxiliary verb (to have) +
        "not" + past participle ...
    - - She/he hasn't gone to work.
      - We haven't been
        to London.
      - I/you haven't talked to Peter.
      - They haven't
        learned English.