2- It is not a noun; it is an absolute clause. 'While' is a conjunction.
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Df20061. Preparing for the speech, John couldn’t help but feel nervous. (the underlined phrase is a participial phrase functioning as an adjective modifying John.)The participial clause "Preparing for the speech" is functioning as an 'adjunct' of the kind commonly called a 'supplement'. Notice how it's set apart from the main clause by a comma. That tells us