Chinese Potential Complements: How to Use 得 and 不 (看得懂 vs. 看不懂)

When speaking English, expressing whether you can or cannot achieve a result usually requires a modal verb like "can" or "cannot":

• "I can understand this technical manual."
• "I cannot afford this downtown apartment."
• "The music is too loud; I cannot hear what you are saying."

In Mandarin Chinese, while you can use modal verbs like 能 (néng) or 可以 (kěyǐ), native speakers far more frequently use an elegant and compact grammatical structure: the potential complement (可能补语 - kěnéng bǔyǔ).

Instead of saying "我不能看懂", a native speaker will say:

• 我看不懂。 (Wǒ kàn bu dǒng. -> "I cannot understand by reading.")

And if they can understand it, they insert 得 (de):

• 我看得到。 (Wǒ kàn de dào. -> "I can see it.")

Potential complements are tested on every HSK exam from HSK 2 through HSK 6 and are essential for sounding natural in daily conversations, business negotiations, and academic discussions.

Here is the fundamental rule:

A potential complement indicates whether an action can or cannot achieve a specific outcome or direction, based on current conditions, physical capacity, or personal ability. Insert 得 (de) for "can," and insert 不 (bu) for "cannot."

Let us explore how to construct potential complements, examine high-frequency pairs, master object placement, contrast them with modal verbs, and review common learner mistakes. For foundational grammar structures, check out our Chinese grammar for beginners guide.

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1. Quick Summary: Potential Complement Formulas

+-------------------------------------------------------------+
|                 POTENTIAL COMPLEMENT FORMULAS               |
|                                                             |
|  Affirmative (Can):  Verb + 得 + Result / Direction Complement |
|  Negative (Cannot):  Verb + 不 + Result / Direction Complement |
|                                                             |
|  * 得 is pronounced with a light, neutral tone: "de"        |
|  * 不 is pronounced with a light tone or neutral: "bu"      |
+-------------------------------------------------------------+

Type	Chinese Formula	Example	Pinyin & Meaning
Affirmative	Verb + 得 + Complement	看得懂	kàn de dǒng (can understand by reading)
Negative	Verb + 不 + Complement	看不懂	kàn bu dǒng (cannot understand by reading)
Question (A-not-A)	Verb + 得 + Comp + Verb + 不 + Comp?	看得懂看不懂？	kàn de dǒng kàn bu dǒng? (can you understand it or not?)
Question (with 吗)	Verb + 得 + Comp + 吗？	看得懂吗？	kàn de dǒng ma? (can you understand it?)

Notice that the negative form replaces 得 entirely with 不. You never say "不看得懂".

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2. High-Frequency Potential Complement Pairs

Below are the most common potential complement combinations used in everyday life, organized by their complement type:

1. Comprehension & Sensory Perception (懂, 见, 清)

• 看得懂 / 看不懂: Can / cannot understand by reading.
• 听得懂 / 听不懂: Can / cannot understand by listening.
• 听得见 / 听不见: Can / cannot hear (sensory capability).
• 看得到 / 看不到: Can / cannot see / spot.
• 看清楚 / 看不清楚: Can / cannot see clearly.

Detailed Sentence Examples:

1. 这篇关于量子计算的英文科研论文太深奥了，我完全看不懂。

   • Pinyin: Zhè piān guānyú liàngzǐ jìsuàn de Yīngwén kēyán lùnwén tài shēn'ào le, wǒ wánquán kàn bu dǒng.
   • English: This English research paper on quantum computing is too profound; I cannot understand it at all.
   • Comprehension Note: The reader's eyes can see the characters, but their brain cannot parse the meaning.

2. 会议室后排的扩音设备坏了，坐在最后一排的参会人员听不见主持人的声音。

   • Pinyin: Huìyìshì hòupái de kuòyīn shèbèi huài le, zuò zài zuìhòu yí pái de cānhuì rényuán tīng bu jiàn zhǔchíren de shēngyīn.
   • English: The loudspeaker equipment at the back of the meeting room is broken; participants sitting in the last row cannot hear the host's voice.
   • Sensory Note: Physical sound volume is insufficient to reach the listener's ears.

3. 投影仪的光线太暗，台下的学生看不清楚黑板上的数学公式。

   • Pinyin: Tóuyǐngyí de guāngxiàn tài àn, tái xià de xuésheng kàn bu qīngchu hēibǎn shang de shùxué gōngshì.
   • English: The projector light is too dim; students below the stage cannot see the mathematical formulas on the blackboard clearly.

2. Physical & Financial Capacity (起, 动, 下)

• 买得起 / 买不起: Can / cannot afford financially.
• 搬得动 / 搬不动: Can / cannot lift or move physically.
• 吃得下 / 吃不下: Can / cannot eat anymore (stomach capacity or appetite).
• 住得起 / 住不起: Can / cannot afford to stay or live somewhere.

Detailed Sentence Examples:

1. 市中心那套临江高层景观公寓租金太高，刚毕业的大学生根本租不起。

   • Pinyin: Shìzhōngxīn nà tào línjiāng gāocéng jǐngguān gōngyù zūjīn tài gāo, gāng bìyè de dàxuéshēng gēnběn zū bu qǐ.
   • English: The rent for that high-rise riverside view apartment downtown is too expensive; newly graduated college students simply cannot afford to rent it.
   • Capacity Note: 起 (qǐ) as a potential complement relates to financial or social affordability.

2. 这个装满厚重书籍的旧木箱太沉了，我一个人根本搬不动。

   • Pinyin: Zhè ge zhuāng mǎn hòuzhòng shūjí de jiù mùxiāng tài chén le, wǒ yí ge rén gēnběn bān bu dòng.
   • English: This old wooden crate filled with heavy books is too heavy; I alone cannot move it at all.
   • Measure Word: Notice 箱 (xiāng); review our Chinese measure words guide.

3. 跑完五公里越野赛之后我太恶心了，现在一口饭也吃不下。

   • Pinyin: Pǎo wán wǔ gōnglǐ yuèyě sài zhīhòu wǒ tài ěxīn le, xiànzài yì kǒu fàn yě chī bu xià.
   • English: After running the five-kilometer cross-country race I felt nauseous; right now I cannot eat a single bite of food.
   • Emphatic Negation: Notice 一口饭也...; see our guide to 也 vs. 还 in Chinese.

3. Completion & Time Constraints (完, 了)

• 做得到 / 做不到: Can / cannot achieve or accomplish a task.
• 做得完 / 做不完: Can / cannot finish on time.
• 忘不了 / 忘得了: Can / cannot forget.
• 受得了 / 受不了: Can / cannot endure or tolerate.

Detailed Sentence Examples:

1. 周五下班前要提交三份详尽的审计报告，我们团队肯定做不完。

   • Pinyin: Zhōuwǔ xiàbān qián yào tíjiāo sān fèn xiángjìn de shěnjì bàogào, wǒmen tuánduì kěndìng zuò bu wán.
   • English: Submitting three detailed audit reports before leaving work on Friday is something our team definitely cannot finish.

2. 南方的梅雨季节又闷又潮湿，北方来出差的同事直呼受不了。

   • Pinyin: Nánfāng de méiyǔ jìjié yòu mèn yòu cháoshī, běifāng lái chūchāi de tóngshì zhí hū shòu bu liǎo.
   • English: The plum rain season in the south is both stuffy and humid; colleagues on business trips from the north blurt out that they cannot stand it.
   • Fixed Expression: 受不了 (shòu bu liǎo) is an everyday idiom meaning "cannot tolerate."

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3. Potential Complements vs. Modal Verbs (能 / 可以)

A common dilemma for learners is choosing between 不能 + Verb and Verb + 不 + Complement.

While both express inability, their pragmatic nuances are distinctly different:

Structure	Typical Meaning & Nuance	Real-World Context
不能 / 不可以 + Verb	Prohibition, moral restraint, or objective rule	"You are not permitted to do this" or "External circumstances forbid it."
Verb + 不 + Complement	Subjective limitation or conditional impossibility	"I tried, but my personal ability, eyesight, or wallet cannot achieve the outcome."

Practical Contrast:

1. 我不能吃辣。 (Wǒ bù néng chī là.)
   • Nuance: I am medically not allowed to eat spicy food (e.g., doctor's orders or stomach ulcer).
2. 这份变态辣火锅我吃不下去。 (Zhè fèn biàntài là huǒguō wǒ chī bu xiàqù.)
   • Nuance: I tried eating this ultra-spicy hotpot, but the burn was so intense that my mouth physically could not swallow more.

For a full breakdown of modal verbs, see our guide to 会 vs. 能 vs. 可以.

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4. Word Order: Where Does the Object Go?

When the sentence includes an object (e.g., a book, a contract, a language), where does the noun sit? In Chinese, there are two standard patterns:

Pattern A: Verb + 得/不 + Complement + Object (Most Common)

• Formula: Subject + Verb + 得/不 + Complement + Object
• Example:
  • 他听不懂当地方言。
  • Pinyin: Tā tīng bu dǒng dāngdì fāngyán.
  • English: He cannot understand the local dialect by listening.

Pattern B: Topicalized Object (Object First for Emphasis)

• Formula: Object + Subject + Verb + 得/不 + Complement
• Example:
  • 这份全德语编写的产品说明书，你一个人看得懂吗？
  • Pinyin: Zhè fèn quán Déyǔ biānxiě de chǎnpǐn shuōmíngshū, nǐ yí ge rén kàn de dǒng ma?
  • English: This product manual written entirely in German, can you understand it all by yourself?
  • Effect: Placing the complex noun phrase at the very beginning keeps the verb and complement tight and uncluttered.

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5. Real-World Conversational Dialogues

Dialogue 1: Reviewing Architecture Blueprints

• Client: 林工，这套新住宅的复式户型设计图，我怎么看不太懂承重墙的位置？
  • Pinyin: Lín gōng, zhè tào xīn zhùzhái de fùshì hùxíng shèjìtú, wǒ zěnme kàn bú tài dǒng chéngzhòngqiáng de wèizhǐ?
  • English: Engineer Lin, regarding these duplex apartment blueprints, why can I not quite understand where the load-bearing walls are? (Comprehension -> 看不懂)
• Architect: 您看这里加粗的黑色实线，普通隔断墙砸得掉，但这些承重结构绝对动不得。
  • Pinyin: Nín kàn zhèlǐ jiācū de hēisè shíxiàn, pǔtōng géduànqiáng zá de diào, dàn zhèxiē chéngzhòng jiégòu juéduì dòng bu de.
  • English: Look at the thickened black solid lines here; ordinary partition walls can be knocked down, but these load-bearing structures absolutely cannot be touched. (Possibility -> 砸得掉, 动不得)
• Client: 明白了！那我就可以放心地规划开放式厨房了。
  • Pinyin: Míngbai le! Nà wǒ jiù kěyǐ fàngxīn de guīhuà kāifàngshì chúfáng le.
  • English: Understood! Then I can confidently plan the open kitchen.

Dialogue 2: Searching for an Important File in the Cloud

• Manager: 昨天发到公用云盘里的季度数据备份，你找得到吗？
  • Pinyin: Zuótiān fā dào gōngyòng yúnpán lǐ de jìdù shùjù bèifèn, nǐ zhǎo de dào ma?
  • English: The quarterly data backup uploaded to the public cloud drive yesterday, can you find it? (Ability to locate -> 找得到)
• Assistant: 我在搜索框里查了好几次，系统显示权限受限，我进不去那个受保护的文件夹。
  • Pinyin: Wǒ zài sōusuǒ kuàng lǐ chá le hǎo jǐ cì, xìtǒng xiǎnshì quánxiàn shòuxiàn, wǒ jìn bu qù nàge shòu bǎohù de wénjiànjiā.
  • English: I searched in the search box multiple times; the system indicates restricted permissions, and I cannot get into that protected folder. (Inability to enter -> 进不去)
• Manager: 别着急，我马上让管理员把访问密钥发到你的工作邮箱。
  • Pinyin: Bié zháojí, wǒ mǎshàng ràng guǎnlǐyuán bǎ fàngwèn mìyào fā dào nǐ de gōngzuò yóuxiāng.
  • English: Do not worry, I will immediately have the administrator send the access key to your work mailbox.

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6. Common Mistakes to Avoid

Mistake 1: Saying "不看得懂" Instead of "看不懂"

• Wrong: 我不看得懂这篇古文。
  • Pinyin: Wǒ bù kàn de dǒng zhè piān gǔwén. (Incorrect)
  • Why it fails: Negation is formed by replacing 得 with 不 inside the compound.
• Correct: 我看不懂这篇古文。
  • Pinyin: Wǒ kàn bu dǒng zhè piān gǔwén.
  • English: I cannot understand this classical prose.

Mistake 2: Inserting 了 into a Potential Complement

Potential complements describe ongoing ability or hypothetical outcome, not completed actions.

• Wrong: 今天的生词太多了，我记不住了。 (Grammatical only if it means a change of state like "I can no longer remember") -> 昨天那么多生词我没记住了。
  • Pinyin: Zuótiān nàme duō shēngcí wǒ méi jìzhù le. (Incorrect blend)
  • Rule: If an action already failed in the past, use a negated result complement: 我没记住 (Wǒ méi jìzhù - I did not memorize/remember). Save 记不住 for general capability.

Mistake 3: Confusing 得 (de) with 的 (de)

• Wrong: 他买的起这辆跑车。
  • Pinyin: Tā mǎi de qǐ zhè liàng pǎochē. (Incorrect character)
  • Why it fails: Potential complements must use the structural particle 得, never the possessive 的. Review our guide to the three "de" particles (的, 得, 地).

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7. Frequently Asked Questions

Can potential complements be used in 把 and 被 sentences?

Generally, no! Both the 把 disposal sentence and the 被 passive sentence require a definite, completed result. They cannot take potential complements like 看得懂 or 买不起. Instead of saying "我把书看不懂", you simply say "我看不懂这本书".

What does 了 (liǎo) mean as a potential complement?

When the character 了 is pronounced liǎo (third tone), it acts as a versatile potential complement meaning "able to finish, happen, or tolerate":

• 去得了 (qù de liǎo - can go) / 去不了 (qù bu liǎo - cannot go).
• 吃得了 (chī de liǎo - can finish eating) / 吃不了 (chī bu liǎo - cannot finish eating).
• 受得了 (shòu de liǎo - can bear) / 受不了 (shòu bu liǎo - cannot bear).

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8. Master Chinese Grammar with learnchineseapp.com

Potential complements are one of the most expressive features of the Chinese language. Mastering them allows you to convey nuance, physical limitation, and practical feasibility with natural brevity.

At learnchineseapp.com, you can:

• Interactive Potential Drills: Practice transforming clunky "不能" sentences into sleek Verb + 得 / 不 complements across interactive real-world drills.
• Audio Intonation Feedback: Train your listening skills to recognize unstressed neutral tones in 看得懂 and 听不见.
• Comprehensive Grammar Hub: Seamlessly explore related lessons on result complements, the 3 de particles, and modal verbs 会, 能, and 可以.

Start practicing today and speak Chinese with natural confidence!