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All of your sentences are valid and usual French. The third sentence indeed negates the first one : (1) Il n'y a qu'un livre: there is just one book (i.e. there are no more books than that one) (3) Il n'y a pas qu'un livre: there is not just one book (i.e. there are more books than that one) In the second sentence, plus isn't there no negate anything but to ...


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