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Thread: modal perfect

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    #1

    modal perfect

    Hello,

    I have read that we can't construct a modal perfect sentence with 'can have' except 'can't have'.

    She can't have killed her friend. (That's ok)

    My question is can we construct a modal perfect question (negative or positive) sentence with
    'can have' ?

    -Can she have killed her friend?

    -Can't she have killed her friend?

    Thanks...

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    #2

    Re: modal perfect

    Quote Originally Posted by aysaa View Post
    Hello,

    I have read that we can't construct a modal perfect sentence with 'can have' except 'can't have'.

    She can't have killed her friend. (That's ok) - Yes, that's OK if you mean that it is a physical impossibility that she killed her friend.

    My question is can we construct a modal perfect question (negative or positive) sentence with 'can have'? No.

    -Can she have killed her friend?
    Could she have killed her friend?

    -Can't she have killed her friend?
    Couldn't she have killed her friend?

    Thanks.
    See above.

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