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Present Perfect and Past Perfect

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  • We experienced a lot problems lately.
    Incorrect
  • Sarah has finally graduated in October.
    Incorrect
  • At the end of the 19th. century, Thomas Jefferson has become president.
    Incorrect
  • She has lived in Los Angeles for ten years when she moved to San Diego.
    Incorrect
  • When everyone had finished, the teacher leaves the class.
    Incorrect
  • The teacher realized he had made a huge mistake.
    Correct
  • You have worked very hard lately.
    Correct
  • She got a job last week.
    Correct
  • I know you have always tried to be helpful.
    Correct
  • He has done his homework yesterday.
    Incorrect
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