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How to use "to be sure ..."

I am not sure about (or: of?) how reliable this test is.

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    Corrections

     

    I am not sure about (or: of?) how reliable this test is.

     

    Here are examples of how to follow "sure" with "about" or "of."

     

    I am not sure about that.

    I am not sure of my feelings.

     

    Hope that helps :)

     

    I am not sure about (or: of?) how reliable this test is.

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