1. Is the writer of the original a native speaker? = I have no opinion; please tell me.
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Mister Micawber2. Is the writer of the original not a native speaker? = I thought so, but please tell me3. Isn't the writer of the original a native speaker? = I thought so, but please tell meOh.. #2 and #3 are exactly the same!
moon7296Does #2 happen to be old-fashioned or is it just as it is and used depending on situations?'Is not' is simply a slightly more formal or emphatic form of 'isn't'.