A pro-form is a type of
function word or expression that stands in for another (expresses the same content as) a word, phrase, clause, or sentence whose meaning is recoverable from the context. They are used to avoid repetitive expressions and in
quantification.Pro-forms are divided into several categories according to which
part of speech they substitute:A
pronoun substitutes a
noun or a
noun phrase with or without a
determiner: it, this.A pro-adjective substitutes an
adjective or a phrase functioning as an adjective: so as in "It is less so than we had expected."A pro-adverb substitutes an
adverb or a phrase functioning as an adverb: how or this way.A
pro-verb substitutes a
verb or a
verb phrase: do.A
pro-sentence substitutes an entire sentence or subsentence: Yes or (some have argued) that as in "That is true."
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