不得不 (have to)

• 拼音: bùdébù
• 结构: Subj. + 不得不 + Verb + (Object)
• 汉字拆解: 得 = 彳 (step) + 旦 (dawn) + 寸 (inch), originally meaning to obtain

含义

The structure 不得不 literally means 'cannot not' and expresses being forced or compelled to do something. It conveys reluctant necessity — the speaker has no choice but to perform the action, often due to external circumstances.

不得不 is a double-negation structure that creates a strong sense of compulsion. Unlike 必须 which is a straightforward 'must,' 不得不 implies the speaker would prefer not to do the action but has no alternative. It is more formal and literary than 没办法只好, though both convey reluctant obligation. Compared to 只好 which emphasizes resigned acceptance, 不得不 stresses the impossibility of avoiding the action. This pattern frequently appears in formal writing, news reports, and analytical essays, though it is also used in educated spoken Chinese.

例句

1. 由于签证过期，他不得不提前回国。
2. 面对巨大的压力，公司不得不裁减人员。
3. 事情已经到了这个地步，我们不得不重新考虑方案。

用法指南

语境: written, spoken, formal

语气: reluctant

正确说法

• 为了家人的健康，他不得不戒掉了抽烟的习惯。
• 原计划取消了，我们不得不另想办法。
• 经费不足，研究团队不得不缩小实验规模。

错误说法

• 我不得不不去参加聚会。(Stacking 不得不 with another 不 creates an awkward triple negation — rephrase to 我不得不放弃参加聚会 or 我只好不去参加聚会) → 我只好不去参加聚会了。
• 他不得不很高兴。(不得不 can only precede verbs or verb phrases, not adjectives — being forced into an emotional state requires restructuring, such as 他不得不装出高兴的样子) → 他不得不装出高兴的样子。

起源与历史

The pattern 不得不 uses double negation (不 + 得 + 不) to express affirmative necessity. This rhetorical device has roots in classical Chinese, where double negation was commonly used for emphatic affirmation. The structure literally means 'cannot not do,' conveying that no alternative exists.

文化背景

世代: All ages

社会背景: Universal