是否

• 拼音: shì fǒu
• 汉字拆解: 是 = 日 (sun) + 疋 (foot), originally meaning correct or right; 否 = 不 (not) + 口 (mouth), meaning to deny

含义

Whether or not; if. A formal way to ask about or state a yes/no condition.

A formal equivalent of 是不是, used in written Chinese, official documents, news reports, and formal speech. Introduces a yes/no question or condition. Much more formal than spoken alternatives.

例句

1. 请确认一下您是否已经收到了邮件。
2. 他还在考虑是否要换工作。
3. 这个方案是否可行，还需要进一步讨论。

用法指南

语境: writing, business, official

语气: polite

正确说法

• 我想了解一下这个活动是否还有名额。(I would like to know whether there are still spots available for this event.)
• 请问您是否需要帮助？(May I ask whether you need help?)

错误说法

• 你是否要吃饭？(Don't use 是否 in casual conversation with friends — it sounds overly formal; use 你要不要吃饭 instead.)

起源与历史

Compound of 是 (to be, yes) and 否 (not, no), literally 'yes or no' — a classical Chinese construction.

文化背景

世代: All ages

社会背景: Universal