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    #1

    "Scientists have proof/proven that photovoltaic cells convert sunlight into energy."

    "Scientists have proof/proven that photovoltaic cells convert sunlight into energy."
    Are both proof and proven correct in this sentence ?

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    #2

    Re: "Scientists have proof/proven that photovoltaic cells convert sunlight into energ

    Quote Originally Posted by birgit33 View Post
    "Scientists have proof/proven that photovoltaic cells convert sunlight into energy."
    Are both proof and proven correct in this sentence ?
    Yes, they are both correct, the meaning is different though.

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    #3

    Re: "Scientists have proof/proven that photovoltaic cells convert sunlight into energ

    [AmE - not a teacher]

    Notice that one form of the word is a noun, while the other is a verb. Perhaps this crude example will help show the difference:

    "I have a piece of paper that shows evidence that ... "

    The piece of paper would be having the proof.

    Showing evidence would be the proving.

    Indeed, one could say:

    "Scientists have proof proving that ... " or "Scientists have proven with proof that ... " (though the redundancies sound very awkward.)
    Last edited by BobSmith; 01-Mar-2012 at 12:32.

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