Quote:"The surface of the dining table needs to be wiped clean."
When I first read the sentence...and accepted (for purposes of the question) that there were three nouns...the only word I came up with that might be the third noun...was "clean."
I am definitely having trouble conceiving of it as a noun...although I can see how a case can be made for it.
I notice in Wikipedia, the definition of noun has been expanded from a person, place, thing, or idea...to
In linguistics, a noun is a member of a large, open lexical category whose members can occur as the main word in the subject of a clause, the object of a verb, or the object of a preposition.[1]
Lexical categories are defined in terms of the ways in which their members combine with other kinds of expressions. The syntactic rules for nouns differ from language to language. In English, nouns are those words which can occur with articles and attributive adjectives and can function as the head of a noun phrase.
Object of a verb? "Wiped clean."
Dunno. In any case, I suspect the teacher is anything but an idiot.