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Enough has been said about his problems.

Is Enough a noun phrase and the fused-head construction in the sentence above?

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I think it is.

Comments  

"Enough" in the given sentence is a noun, equivalent to: "A sufficient number of words" or "An abundance of words" or "An overabundance of words."

anonymous

"Enough" in the given sentence is a noun, equivalent to: "A sufficient number of words" or "An abundance of words" or "An overabundance of words."

That's as I take it. On the other hand, Enough is a determiner in the NP and forms fused-head construction Enough in that sentence.