PRESENT PERFECT

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The present perfect is a verb tense which is used to show that an action has taken place once or many times before now. The present perfect is most frequently used to talk about experiences or changes that have taken place, but there are other less common uses as well. 

The present perfect is formed using has/have + past participle. Questions are indicated by inverting the subject and has/have. Negatives are made with not.

  • Statement: You have seen that movie many times.
  • Question: Have you seen that movie many times?
  • Negative: You have not seen that movie many times.

Examples:

  • I have seen that movie twenty times.
  • I think I have met him once before.
  • There have been many earthquakes in California.
  • People have traveled to the Moon.
  • People have not traveled to Mars.
  • Have you read the book yet?
  • Nobody has ever climbed that mountain.
  • A: Has there ever been a war in the United States?
    B: Yes, there has been a war in the United States.



Information in:
https://www.englishpage.com/verbpage/presentperfect.html
https://learnenglish.britishcouncil.org/english-grammar/present-perfect
exercises:
https://www.perfect-english-grammar.com/present-perfect-exercises.html
https://www.really-learn-english.com/present-perfect-exercises.html#03
https://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

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