Pro-sentence
Encyclopedia
A pro-sentence is a function word
Function word
Function words are words that have little lexical meaning or have ambiguous meaning, but instead serve to express grammatical relationships with other words within a sentence, or specify the attitude or mood of the speaker...

 or expression that substitutes for a whole sentence
Sentence (linguistics)
In the field of linguistics, a sentence is an expression in natural language, and often defined to indicate a grammatical unit consisting of one or more words that generally bear minimal syntactic relation to the words that precede or follow it...

 whose content is recoverable from the context. Pro-sentences are a kind of pro-form
Pro-form
A pro-form is a type of function word or expression that stands in for another word, phrase, clause or sentence where the meaning is recoverable from the context...

s and are therefore anaphoric
Anaphora (linguistics)
In linguistics, anaphora is an instance of an expression referring to another. Usually, an anaphoric expression is represented by a pro-form or some other kind of deictic--for instance, a pronoun referring to its antecedent...

.

In English
English language
English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

, yes, no
Yes and no
Yes and no are two words for expressing affirmatives and negatives respectively in English . Early Middle English had a four-form system, but Modern English has reduced this to a two-form system consisting of 'yes' and 'no'. Some languages do not answer yes-no questions with single words meaning...

, okay
Okay
"Okay" is a colloquial English word denoting approval, acceptance, agreement, assent, or acknowledgment. "Okay" has frequently turned up as a loanword in many other languages...

and amen
Amen
The word amen is a declaration of affirmation found in the Hebrew Bible and New Testament. Its use in Judaism dates back to its earliest texts. It has been generally adopted in Christian worship as a concluding word for prayers and hymns. In Islam, it is the standard ending to Dua and the...

are common pro-sentences. In response to the question "Does Mars have two moons?", the sentence "Yes" can be understood to abbreviate "Mars has two moons."

Pro-sentences are sometimes seen as grammatical interjection
Interjection
In grammar, an interjection or exclamation is a word used to express an emotion or sentiment on the part of the speaker . Filled pauses such as uh, er, um are also considered interjections...

s, since they are capable of very limited syntactical
Syntax
In linguistics, syntax is the study of the principles and rules for constructing phrases and sentences in natural languages....

 relations. But they can also be classified as a distinct part of speech, given that (other) interjections have meanings of their own and are often described as expressions of feeling
Feeling
Feeling is the nominalization of the verb to feel. The word was first used in the English language to describe the physical sensation of touch through either experience or perception. The word is also used to describe experiences, other than the physical sensation of touch, such as "a feeling of...

s or emotion
Emotion
Emotion is a complex psychophysiological experience of an individual's state of mind as interacting with biochemical and environmental influences. In humans, emotion fundamentally involves "physiological arousal, expressive behaviors, and conscious experience." Emotion is associated with mood,...

s.

Yes and no

In some languages, the equivalents to yes and no may substitute not only a whole sentence, but also a part of it, either the subject
Subject (grammar)
The subject is one of the two main constituents of a clause, according to a tradition that can be tracked back to Aristotle and that is associated with phrase structure grammars; the other constituent is the predicate. According to another tradition, i.e...

 and the verb
Verb
A verb, from the Latin verbum meaning word, is a word that in syntax conveys an action , or a state of being . In the usual description of English, the basic form, with or without the particle to, is the infinitive...

, or the verb and a complement
Complement (linguistics)
In grammar the term complement is used with different meanings. The primary meaning is a word, phrase or clause that is necessary in a sentence to complete its meaning. We find complements that function as an argument and complements that exist within arguments.Both complements and modifiers add...

, and can also constitute a subordinate clause
Clause
In grammar, a clause is the smallest grammatical unit that can express a complete proposition. In some languages it may be a pair or group of words that consists of a subject and a predicate, although in other languages in certain clauses the subject may not appear explicitly as a noun phrase,...

.

The Portuguese
Portuguese language
Portuguese is a Romance language that arose in the medieval Kingdom of Galicia, nowadays Galicia and Northern Portugal. The southern part of the Kingdom of Galicia became independent as the County of Portugal in 1095...

 word sim (yes) gives a good example:
Q: Ela está em casa? A: Acredito que sim. — Q: Is she at home? A: I believe that she is (literally, that yes).
Ela não saiu de casa, mas o John sim. — She didn't leave home, but John did (literally, John yes).


In some languages, such as English, yes rebuts a negative question, whereas no affirms it. However, in Japanese
Japanese language
is a language spoken by over 130 million people in Japan and in Japanese emigrant communities. It is a member of the Japonic language family, which has a number of proposed relationships with other languages, none of which has gained wide acceptance among historical linguists .Japanese is an...

, the equivalents of no (iie, uun, (i)ya) rebut a negative question, whereas the equivalents of yes (hai, ee, un) affirm it.
Q: Wakarimasen deshita ka (Did you not understand?)
A: Hai, wakarimasen deshita (No, I didn't — Literally That's right, I didn't understand)


Some languages have a specific word that rebuts a negative question. German
German language
German is a West Germanic language, related to and classified alongside English and Dutch. With an estimated 90 – 98 million native speakers, German is one of the world's major languages and is the most widely-spoken first language in the European Union....

 has "doch"; French
French language
French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...

 has "si"; Norwegian
Norwegian language
Norwegian is a North Germanic language spoken primarily in Norway, where it is the official language. Together with Swedish and Danish, Norwegian forms a continuum of more or less mutually intelligible local and regional variants .These Scandinavian languages together with the Faroese language...

 and Swedish
Swedish language
Swedish is a North Germanic language, spoken by approximately 10 million people, predominantly in Sweden and parts of Finland, especially along its coast and on the Åland islands. It is largely mutually intelligible with Norwegian and Danish...

 have jo. Neither has a clear English translation.
Q: Bist du nicht müde? (Aren't you tired?)
A: Doch. Ich gehe bald schlafen. (Yes. I'm about to go to sleep.)

In philosophy

The prosentential theory of truth
Truth
Truth has a variety of meanings, such as the state of being in accord with fact or reality. It can also mean having fidelity to an original or to a standard or ideal. In a common usage, it also means constancy or sincerity in action or character...

 developed by Dorothy Grover, Nuel Belnap
Nuel Belnap
Nuel D. Belnap, Jr. is an American logician and philosopher who has made many important contributions to the philosophy of logic, temporal logic, and structural proof theory. He has taught at the University of Pittsburgh since 1961; before that he was at Yale University. His best known work is...

, and Joseph Camp, and defended more recently by Robert Brandom, holds that sentences like "p" is true and It is true that p should not be understood as ascribing properties to the sentence "p", but as a pro-sentence whose content is the same as that of "p." Brandom calls " . . .is true" a pro-sentence-forming operator.
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x
OK