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In linguistics and grammar, affirmative and negative are terms of opposite meaning which may be applied to statements, verb phrases, clauses, and some other utterances. Essentially an affirmative (positive) form is used to express the validity or truth of a basic assertion, while a negative form expresses its falsity. Examples are the sentences "Jane is here" and "Jane is not here"; the first is affirmative, while the second is negative. The grammatical category associated with affirmative and negative is called polarity. This means that a sentence, verb phrase, etc. may be said to have either affirmative or negative polarity (its polarity may be either affirmative or negative). Affirmative is generally the unmarked polarity; the negative is marked by a negating word or particle such as the English ''not'', German ''nicht'', Swedish ''inte'', and so on, which reverses the meaning of the predicate. The process of converting affirmative to negative is called negation – the grammatical rules for negation vary from language to language, and a given language may have more than one way of producing negations. Affirmative and negative responses (especially, though not exclusively, to questions) are often expressed using particles such as ''yes'' and ''no'', where ''yes'' is the affirmative and ''no'' the negative particle. ==Affirmative and negative responses== (詳細はparticles) are often found in responses to questions, and sometimes to other assertions by way of agreement or disagreement. In English, these are ''yes'' and ''no'' respectively, in French ''oui'', ''si'' and ''non'', in Swedish ''ja'', ''jo'' and ''nej'', and so on. Not all languages make such common use of particles of this type; in some (such as Welsh) it is more common to repeat the verb or another part of the predicate, with or without negation accordingly. Complications sometimes arise in the case of responses to negative statements or questions; in some cases the response that confirms a negative statement is the negative particle (as in English: "You're not going out? No."), but in some languages this is reversed. Some languages have a distinct form to answer a negative question, such as French ''si'' and Swedish ''jo'' (these serve to contradict the negative statement suggested by the first speaker). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「affirmative and negative」の詳細全文を読む スポンサード リンク
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