Yes and no

Although sometimes classified as interjections, these words do not express emotion or act as calls for attention; they are not adverbs because they do not qualify any verb, adjective, or adverb. They are sometimes classified as a part of speech in their own right: sentence words or word sentences.[1][2][3]

This is the position of Otto Jespersen, who states that "'Yes' and 'No' ... are to all intents and purposes sentences just as much as the most delicately balanced sentences ever uttered by Demosthenes or penned by Samuel Johnson."[4]

Georg von der Gabelentz, Henry Sweet, and Philipp Wegener have all written on the subject of sentence words. Both Sweet and Wegener include yes and no in this category, with Sweet treating them separately from both imperatives and interjections, although Gabelentz does not.[5]

Watts[6] classifies yes and no as grammatical particles, in particular response particles. He also notes their relationship to the interjections oh and ah, which is that the interjections can precede yes and no but not follow them. Oh as an interjection expresses surprise, but in the combined forms oh yes and oh no merely acts as an intensifier; but ah in the combined forms ah yes and ah no retains its stand-alone meaning, of focusing upon the previous speaker's or writer's last statement. The forms *yes oh, *yes ah, *no oh, and *no ah are grammatically ill-formed. Aijmer[7] similarly categorizes the yes and no as response signals or reaction signals.

Ameka classifies these two words in different ways according to the context. When used as back-channel items, he classifies them as interjections; but when they are used as the responses to a yes–no question, he classifies them as formulaic words. The distinction between an interjection and a formula is, in Ameka's view, that the former does not have an addressee (although it may be directed at a person), whereas the latter does. The yes or no in response to the question is addressed at the interrogator, whereas yes or no used as a back-channel item is a feedback usage, an utterance that is said to oneself. However, Sorjonen criticizes this analysis as lacking empirical work on the other usages of these words, in addition to interjections and feedback uses.[8]

Bloomfield and Hockett classify the words, when used to answer yes-no questions, as special completive interjections. They classify sentences comprising solely one of these two words as minor sentences.[2]

Sweet classifies the words in several ways. They are sentence-modifying adverbs, adverbs that act as modifiers to an entire sentence. They are also sentence words, when standing alone. They may, as question responses, also be absolute forms that correspond to what would otherwise be the not in a negated echo response. For example, a "No." in response to the question "Is he here?" is equivalent to the echo response "He is not here." Sweet observes that there is no correspondence with a simple yes in the latter situation, although the sentence-word "Certainly." provides an absolute form of an emphatic echo response "He is certainly here." Many other adverbs can also be used as sentence words in this way.[9]

Unlike yes, no can also be an adverb of degree, applying to adjectives solely in the comparative (e.g., no greater, no sooner, but not no soon or no soonest), and an adjective when applied to nouns (e.g., "He is no fool." and Dyer's "No clouds, no vapours intervene.").[9][10]

Grammarians of other languages have created further, similar, special classifications for these types of words. Tesnière classifies the French oui and non as phrasillons logiques (along with voici). Fonagy observes that such a classification may be partly justified for the former two, but suggests that pragmatic holophrases is more appropriate.[11]

While Modern English has a two-form system of yes and no for affirmatives and negatives, earlier forms of English had a four-form system, comprising the words yea, nay, yes, and no. Yes contradicts a negatively formulated question, No affirms it; Yea affirms a positively formulated question, Nay contradicts it.

• Will they not go? — Yes, they will.
• Will they not go? — No, they will not.
• Will they go? — Yea, they will.
• Will they go? — Nay, they will not.

This is illustrated by the following passage from Much Ado about Nothing:[12]

Claudio: Can the world buie such a iewell? [buy such a jewel]
Benedick: Yea, and a case to put it into, but speake you this with a sad brow?

— William Shakespeare, Much Ado about Nothing, Act I, Scene I

Benedick's answer of yea is a correct application of the rule, but as observed by W. A. Wright "Shakespeare does not always observe this rule, and even in the earliest times the usage appears not to have been consistent." Furness gives as an example the following, where Hermia's answer should, in following the rule, have been yes:[12][13]

Demetrius: Do not you thinke, The Duke was heere, and bid vs follow him?
Hermia: Yea, and my Father.

— William Shakespeare, A Midsummer Night's Dream[12]

This subtle grammatical feature of Early Modern English is recorded by Sir Thomas More in his critique of William Tyndale's translation of the New Testament into Early Modern English, which was then quoted as an authority by later scholars:[12]

I would not here note by the way that Tyndale here translateth no for nay, for it is but a trifle and mistaking of the Englishe worde : saving that ye shoulde see that he whych in two so plain Englishe wordes, and so common as in naye and no can not tell when he should take the one and when the tother, is not for translating into Englishe a man very mete. For the use of these two wordes in aunswering a question is this. No aunswereth the question framed by the affirmative. As for ensample if a manne should aske Tindall himselfe: ys an heretike meete to translate Holy Scripture into Englishe ? Lo to thys question if he will aunswere trew Englishe, he must aunswere nay and not no. But and if the question be asked hym thus lo: is not an heretike mete to translate Holy Scripture into Englishe ? To this question if he will aunswere trewe Englishe, he must aunswere no and not nay. And a lyke difference is there betwene these two adverbs ye and yes. For if the question bee framed unto Tindall by the affirmative in thys fashion. If an heretique falsely translate the New Testament into Englishe, to make his false heresyes seem the word of Godde, be his bokes worthy to be burned ? To this questyon asked in thys wyse, yf he will aunswere true Englishe, he must aunswere ye and not yes. But now if the question be asked him thus lo; by the negative. If an heretike falsely translate the Newe Testament into Englishe to make his false heresyee seme the word of God, be not hys bokes well worthy to be burned ? To thys question in thys fashion framed if he will aunswere trewe Englishe he may not aunswere ye but he must answere yes, and say yes marry be they, bothe the translation and the translatour, and al that wyll hold wyth them.

— Thomas More, The Confutation of Tyndale's Answer, pp. 430[14][15]

In fact, More's exemplification of the rule actually contradicts his statement of what the rule is. This went unnoticed by scholars such as Horne Tooke, Robert Gordon Latham, and Trench, and was first pointed out by George Perkins Marsh in his Century Dictionary, where he corrects More's incorrect statement of the first rule, "No aunswereth the question framed by the affirmative.", to read nay. That even More got the rule wrong, even while himself dressing down Tyndale for getting it wrong, is seen by Furness as evidence that the four word system was "too subtle a distinction for practice".

Marsh found no evidence of a four-form system in Mœso-Gothic, although he reported finding "traces" in Old English. He observed that in the Anglo-Saxon Gospels,

• positively phrased questions are answered positively with gea (John 21:15,16, King James Version: "Jesus saith to Simon Peter, Simon, son of Jonas, lovest thou me more than these? He saith unto him, Yea, Lord; thou knowest that I love thee" etc.)
• and negatively with ne (Luke 12:51, KJ: "Suppose ye that I am come to give peace on earth? I tell you, Nay; but rather division"; 13:4,5, KJ: "Or those eighteen, upon whom the tower in Siloam fell, and slew them, think ye that they were sinners above all men that dwelt in Jerusalem? I tell you, Nay: but, except ye repent, ye shall all likewise perish."), nese (John 21:5 "Then Jesus saith unto them, Children, have ye any meat? They answered him, No."; Matthew 13:28,29, KJ: "The servants said unto him, Wilt thou then that we go and gather them up? But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them."), and nic meaning "not I" (John 18:17, KJ: "Then saith the damsel that kept the door unto Peter, Art not thou also one of this man's disciples? He saith, I am not.");
• while negatively phrased questions are answered positively with gyse (Matthew 17:25, KJ: "they that received tribute money came to Peter, and said, Doth not your master pay tribute? He saith, Yes.")
• and negatively for example with nâ, meaning "no one" (John 8:10,11, "he said unto her, Woman, where are those thine accusers? hath no man condemned thee? She said, No man, Lord.").[13]

Marsh calls this four-form system of Early Modern English a "needless subtlety". Tooke called it a "ridiculous distinction", with Marsh concluding that Tooke believed Thomas More to have simply made this rule up and observing that Tooke is not alone in his disbelief of More. Marsh, however, points out (having himself analyzed the works of John Wycliffe, Geoffrey Chaucer, John Gower, John Skelton, and Robert of Gloucester, and Piers Plowman and Le Morte d'Arthur) that the distinction both existed and was generally and fairly uniformly observed in Early Modern English from the time of Chaucer to the time of Tyndale. But after the time of Tyndale, the four-form system was rapidly replaced by the modern two-form system.[13]

Several languages have a three-form system, with two affirmative words and one negative. In a three-form system, the affirmative response to a positively phrased question is the unmarked affirmative, the affirmative response to a negatively phrased question is the marked affirmative, and the negative response to both forms of question is the (single) negative. For example, in Norwegian the affirmative answer to "Snakker du norsk?" ("Do you speak Norwegian?") is "Ja", and the affirmative answer to "Snakker du ikke norsk?" ("Do you not speak Norwegian?") is "Jo", while the negative answer to both questions is "Nei".[13][16][17][18][19]

Danish, Swedish, Norwegian, Icelandic, Faroese, Hungarian, German, Dutch, French and Malayalam all have three-form systems. Swedish and Danish have ja, jo, and nej. Norwegian has ja, jo/jau, and nei. Icelandic has já, jú, and nei. Faroese has ja, jú, and nei. Hungarian has igen, de, and nem. German has ja, doch, and nein. Dutch has ja, jawel, and nee. French has oui, si, and non. Malayalam has അതേ, ഉവ്വ് and ഇല്ല. Though, technically Malayalam is a multi-form system of Yes and No as can be seen from below, the former are the formal words for Yes and No.

Swedish, and to some extent Danish and Norwegian, also have additional forms javisst and jovisst, analogous to ja and jo, to indicate a strong affirmative response. Swedish (and Danish slang) also have the forms joho and nehej, which both indicate stronger response than jo or nej. Jo can also be used as an emphatic contradiction of a negative statement.[17][20] And Malayalam has the additional forms അതേല്ലോ, ഉവ്വല്ലോ and ഇല്ലല്ലോ which act like question words, question tags or to strengthen the affirmative or negative response, indicating stronger meaning than അതേ, ഉവ്വ് and ഇല്ല. The words അല്ലേ, ആണല്ലോ, അല്ലല്ലോ, വേണല്ലോ, വേണ്ടല്ലോ, ഉണ്ടല്ലോ and ഇല്ലേ work in the same ways. These words also sound more polite as they don't sound like curt when saying "No!" or "Yes!". ഉണ്ട means "it is there" and the word behaves as an affirmative response like അതേ. The usage of ഏയ് to simply mean "No" or "No way!", is informal and may be casual or sarcastic, while അല്ല is the more formal way of saying "false", "incorrect" or that "it is not" and is a negative response for questions. The word അല്ലല്ല has a stronger meaning than അല്ല. ശരി is used to mean "OK" or "correct", with the opposite ശരിയല്ല meaning "not OK" or "not correct". It is used to answer affirmatively to questions to confirm any action by the asker, but to answer negatively one says വേണ്ടാ. വേണം and വേണ്ട both mean to "want" and to "not want".

Like Early Modern English, the Romanian language has a four-form system. The affirmative and negative responses to positively phrased questions are da and nu, respectively. But in responses to negatively phrased questions they are prefixed with ba (i.e. ba da and ba nu). nu is also used as a negation adverb, infixed between subject and verb. Thus, for example, the affirmative response to the negatively phrased question "N-ai plătit?" ("Didn't you pay?") is "Ba da." ("Yes."—i.e. "I did pay."), and the negative response to a positively phrased question beginning "Se poate să ...?" ("Is it possible to ...?") is "Nu, nu se poate." ("No, it is not possible."—note the use of nu for both no and negation of the verb.)[21][22][23]

Bloomfield and Hockett observe that not all languages have special completive interjections.

• Affirmation and negation
• Thumb signal
• Translation
• Untranslatability

• Bob Morris Jones (1999). The Welsh Answering System. Walter de Gruyter. ISBN 978-3-11-016450-3.—Jones' analysis of how to answer questions with "yes" or "no" in the Welsh language, broken down into a typology of echo and non-echo responsives, polarity and truth-value responses, and numbers of forms
• George L. Huttar (1994). "Words for 'yes', 'no', 'maybe'". Ndyuka: A Descriptive Grammar. Routledge. p. 42. ISBN 978-0-415-05992-3.
• Kulick, Don (April 2003). "No". Language & Communication. Elsevier. 23 (2): 139–151. doi:10.1016/S0271-5309(02)00043-5. Pdf. Archived 2015-02-27 at the Wayback Machine