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    • Member Info
      • Native Language:
      • Persian
      • Home Country:
      • Iran
      • Current Location:
      • Iran

    • Join Date: Oct 2013
    • Posts: 641
    #1

    I know I ....... the letter earlier today.

    I know I ....... the letter earlier today.

    1. have had to post
    2. need to post
    3. ought to post
    4. must have posted
    5. could have posted

    I think No.5 would be natural. However, I don't know the grammatical reason behind of that.

  1. Raymott's Avatar
    • Member Info
      • Native Language:
      • English
      • Home Country:
      • Australia
      • Current Location:
      • Australia

    • Join Date: Jun 2008
    • Posts: 24,104
    #2

    Re: I know I ....... the letter earlier today.

    4. is also possible, but 5 is most likely.
    5. "I know I could have posted the letter earlier today. But I didn't have a lot of time, so I posted it this afternoon."
    5. "I know I could have posted the letter earlier today. I posted a lot of mail, and that letter could have been among the others"
    4. "I know I must have posted the letter earlier today. I posted everything in the "out box". If the letter was there, I must have posted it."

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