"What [a mess]" is the subject complement: I think it is actually 'what' that is the simple complement.
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AnonymousIn the sentence "What a mess it is!" is "what a mess" the subject complement or is "what" auxiliary and "a mess" the subject complement? Thank you!The exclamative phrase is the entire noun phrase "What a mess", where "What" is an adjective functioning as modifier of "a mess".