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  1. #1
    Lenka is offline Senior Member
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    Default can't have/couldn't have

    Is there a difference in using these two questoins?:
    -They can't have done it. They weren't here.
    -They couldn't have done it. They weren't here.

    Thanks.
    Lenka

  2. #2
    Natalie27 Guest

    Default Re: can't have/couldn't have

    Quote Originally Posted by Lenka
    Is there a difference in using these two questoins?:
    -They can't have done it. They weren't here.
    -They couldn't have done it. They weren't here.

    Thanks.
    Lenka
    The first sentence is wrong, Lenka.
    The second sentence sounds fine to me.

  3. #3
    Tomasz Klimkiewicz is offline Senior Member
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    Default Re: can't have/couldn't have

    'They can't have done it' is an absolutely correct English sentence. Its meaning is past impossibility (note the perfect infinitive), and just the opposite to 'They must have done it'.

    Dear Experts, please correct me if I'm wrong.

    All the best,

    Tee Kay

  4. #4
    Lenka is offline Senior Member
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    Default Re: can't have/couldn't have

    I think the first question is all right, isn't it?
    can someone other have a look at it, please?


    Lenka

  5. #5
    TheMadBaron Guest

    Default Re: can't have/couldn't have

    They're both fine.

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