’Ah! it’s me, and me’s the first person singular, nominative case, agreeing with the verb "it’s", and governed by Squeers understood, as a acorn, a hour; but when the h is sounded, the a only is to be used, as a and, a art, a ighway,’ replied Mr Squeers, quoting at random from the grammar.
There are no more uses of "first person" in the book.
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It is a first-person essay.
Or if you turn into one of those girlfriends, always ponying around after her boyfriend, and speaking in the first-person plural.