是否 (whether or not)

Chinese Grammar Advanced Chinese ★★★★ 4/5 formal shìfǒu
拼音 shìfǒu
结构 是否 + Verb / Adjective
汉字拆解 是 = 日 (sun) + 疋 (correct), meaning to be/yes; 否 = 不 (not) + 口 (mouth), meaning no/not

含义

是否 (shìfǒu) means 'whether or not' or 'is or is not.' It introduces an embedded yes-no question, typically in formal or written contexts, asking whether something is the case.

是否 is the formal equivalent of the colloquial 是不是. It is used to embed a question within a larger statement, often after verbs like 确认 (confirm), 了解 (understand), 考虑 (consider), or 决定 (decide). Unlike 是不是 which can appear as a tag question at the end of a sentence, 是否 always appears before the verb or adjective being questioned. It is standard in official documents, surveys, academic writing, and formal correspondence. 是否 can be followed by a verb, adjective, or verb phrase. It does not require a question mark when embedded in a declarative sentence.

例句

  1. 请确认您是否已经收到我们的邮件。
  2. 我不确定他是否同意这个方案。
  3. 公司正在评估是否有必要扩大生产规模。

用法指南

语境: written, formal speech, official documents

语气: inquiring

正确说法

  • 请问您是否需要开发票？
  • 我们需要讨论是否继续推进这个项目。
  • 调查问卷询问居民是否满意社区服务。

错误说法

  • 你是否喜不喜欢吃辣？(是否 already contains the positive-negative contrast — adding 喜不喜欢 is redundant) → 你是否喜欢吃辣？
  • 是否他来了吗？(是否 embeds a question and should not be combined with the question particle 吗) → 他是否来了？

起源与历史

是否 is a classical construction combining 是 (yes/is) and 否 (no/not). In Classical Chinese, the 是否 pattern was already used to pose alternatives. It remains one of the most recognizable formal registers in modern Mandarin.

文化背景

世代: All ages

社会背景: Universal

相关短语

就 (limiting scope) 就 (jiù) can be used to limit or narrow the scope of a statement, meaning 'just' or 'only regarding.' In this usage, 就 restricts the subject, object, or range of an action to a specific domain. 性 (indicating a characteristic) 性 (xìng) is a suffix added to words to indicate a characteristic, quality, or nature. It transforms adjectives, verbs, and nouns into abstract nouns describing properties or tendencies, similar to English suffixes '-ity,' '-ness,' or '-ability.' 本 (this / our side) 本 (běn) is used as a prefix meaning 'this' or 'our' when referring to one's own organization, group, or entity. It creates a formal, institutional reference to the speaker's own side, common in official and professional contexts. 毕竟 (after all) 毕竟 (bìjìng) means 'after all' or 'when all is said and done.' It introduces a reason or fact that should be considered as a mitigating factor, often used to justify or explain something despite other circumstances. 以...的名义 (in the name of) 以...的名义 (yǐ...de míngyì) means 'in the name of' or 'under the guise of.' It indicates that an action is performed using a particular identity, authority, or pretext as justification or cover. 兼 (concurrently / at the same time) 兼 (jiān) indicates that a subject simultaneously holds two roles, possesses two qualities, or performs two functions at the same time. It conveys the idea of combining or doing double duty. 再三 (over and over again) 再三 (zàisān) means 'over and over again' or 'repeatedly.' It is used before a verb to emphasize that an action has been done multiple times, often with a sense of earnestness or insistence. 凡是 (as long as / all that) 凡是 (fánshì) means 'all that,' 'every,' or 'as long as it is.' It introduces a universal category or condition, asserting that everything meeting the stated criterion shares the same outcome or characteristic.
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