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  • It is possible that Bill was out of town
    Bill may/might/could have been out of town.
  •  15
  • It is not possible that Jane knew about my birthday party.
    Jane can't/couldn't have known about my birthday party.
  •  15
  • I'm certain that Joseph was responsible for the mistake.
    Joseph must have been responsible for the mistake.
  •  15
  • It is possible that Andrew did not hear the news about his brother.
    Andrew may/might not have heard the news about his brother.
  •  15
  • It is strange that nobody called me yesterday. /Should/
    Somebody should have called me yesterday.
  •  15
  • It is impossible that you saw me last weekend. I was on holiday.
    You couldn't/can't have seen me last weekend. I was on holiday.
  •  15
  • I'm sure the politician knew that he was going to lose the election.
    The politician must have know he was going to lose the election.
  •  15
  • It is strange that it was so cold last month. Normally August is a very hot month. /shouldn't/
    It shouldn't have been so cold in August.
  •  15
  • Her Russian is excellent. It is possible that she had a very good teacher.
    She may/might/could have had a very good teacher.
  •  15
  • It is strange that Nick was in Paris. He booked a flight to Rome. /shouldn't/ /should/
    Nick shouldn't have been in Paris. He should have been in Rome.
  •  15