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HSK 7-9 Four-Character Pattern: 不A而B (bù A ér B)
不A而B appears in familiar four-character expressions such as 不劳而获 and 不约而同. Some mean that B happens without A; others describe the manner or state in which B occurs, as in 不欢而散. The whole expression determines the precise relationship.
真正持久的成功绝不可能是靠不劳而获换来的。
Here 不劳而获 is the object of 靠, used as a preposition meaning by or relying on. It refers to obtaining a benefit without doing the work.
Read the full explanation and examples
Core Meaning and Internal Structure
The supplied HSK outline lists 不A而B under four-character fixed phrases at levels 7–9. Many familiar expressions mean that B occurs without A, such as 不劳而获. The frame also includes 不欢而散, parting unhappily: 欢 describes a state, not a preliminary action that must be completed.
In the compact frame, A and B each occupy one character. 不 negates A, and 而 links it with B. The relationship can involve contrast, an absent action, or the manner of the following action. Literary meanings matter: 劳 is to labour, 获 is to obtain, and 喻 in 不言而喻 concerns understanding.
真正持久的成功绝不可能是靠不劳而获换来的。
Here 不劳而获 is the object of 靠, used as a preposition meaning by or relying on. It refers to obtaining a benefit without doing the work.
Natural Usage and Syntactic Roles
Familiar expressions occur in both writing and conversation, with register varying by phrase. Their sentence roles also differ. Read each whole expression in context instead of assigning all phrases one grammatical function.
- Adverbial use: 不约而同 can modify an action with 地, as in 不约而同地鼓掌. 不期而遇 instead commonly describes the meeting itself, as in 两人在门口不期而遇; do not mechanically add 地 and a second verb.
- As a predicate or attributive modifier (谓语 / 定语): Idioms such as 不言而喻 (self-evident without needing to be spoken) frequently act as the main predicate of a clause or modify an abstract noun (such as 道理, 事实, or 重要性) using 的.
- Other roles: 不劳而获 can follow 靠 or 企图, with the relation depending on the surrounding construction. In 令人不寒而栗, 人 is the person made to shudder, and 不寒而栗 predicates that response of 人; it is not simply the object of 令.
听到这个好消息，在场的人都不约而同地鼓起掌来。
不约而同 means acting in the same way without prior agreement. Here it modifies 鼓起掌来 with 地; 约 refers to agreeing beforehand, not necessarily making an appointment.
保护生态环境很重要，这在今天已经是不言而喻的事实。
不言而喻 (not speaking yet being understood) functions as an attributive modifier connected by 的 before the noun 事实.
Useful Contrast: 不A而B vs. 不A自B
Advanced learners often encounter another four-character frame that looks and sounds very similar: 不A自B, as seen in idioms like 不攻自破 (collapsing on its own without being attacked) or 不请自来 (arriving on one's own without being invited). Comparing the two helps clarify their distinct nuances.
而 links the two parts; 自 in expressions such as 不攻自破 highlights the result occurring of itself rather than through a direct attack. Learn familiar forms such as 不言而喻 and 不攻自破. Similar-looking variants or creative phrases must be judged in context; a dictionary spelling does not justify calling every other combination ungrammatical.
随着权威数据的公开，那些谣言很快就变得不攻自破了。
不攻自破 means that a claim collapses without someone needing to attack or refute it directly. The published data provide evidence here, so 自 does not mean that no external factor can play any role.
Familiar Idioms and Clear Fuller Wording
The outline groups this as a fixed-phrase frame. That helps organize familiar expressions; it does not establish a rule that every new combination is a grammar error or loses exam marks. Understand an idiom before using it, and use fuller wording when it communicates more clearly.
不思而答 means answering without thinking. Its compact wording has a literary tone; 没经过思考就回答 spells out the sequence in fuller ordinary prose. Compare the examples below for the difference in style.
面对考官的提问，他紧张得不思而答，结果说错了核心数据。
Compact literary wording: 不思而答 means answering without thinking. For clear everyday prose, 没经过思考就回答 is a fuller alternative. Being an unfamiliar combination does not by itself make it a vocabulary error.
面对考官的提问，他紧张得没经过思考就回答了，结果说错了核心数据。
没经过思考就回答了 spells out answering without prior thought. 了 marks the answer as having occurred; 不思而答 is a more compact, literary way to present the same sequence.
Frequently asked questions
Can I create my own four-character phrases using 不A而B in HSK writing?
Use words and expressions whose meaning you can control. An unfamiliar four-character expression is not automatically wrong, and the outline does not say that only dictionary-listed combinations are permitted. When unsure, a clear fuller clause is a useful choice; this is writing advice, not a quoted scoring rule.
What does the character 而 mean inside the 不A而B pattern?
而 links 不A with B. In 不劳而获 it connects not working with obtaining a benefit; in 不欢而散 it connects an unhappy state with parting. Translate the whole expression rather than assigning 而 the same English word or prerequisite meaning everywhere.
Does the HSK 7-9 classification mean this item is guaranteed to appear on my booked test?
No. The level 7-9 label reflects its placement in the reference syllabus outline (edition 2025-11, implementation label 2026-07), which defines general teaching scope rather than guaranteeing the exact content or version administered at a specific test center.
