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HSK 3 Potential Complements 1: Verb + 得/不 + Verb/Adjective
In Chinese, potential complements insert 得 (de) or 不 (bu) between an action verb and a resultative verb or adjective to indicate whether an outcome is achievable under specific conditions.
电影票太贵了，我买不起。
Uses the verb 起 (qǐ) after 买不 (mǎi bu) as a fixed potential complement meaning 'cannot afford to buy'.
× 我买不票到。
The intended word order is 我买不到票: the object 票 follows 买不到, rather than separating 不 from 到.
Corrected example: 我买不到票。
Read the full explanation and examples
What Is a Potential Complement?
The supplied HSK Level 3 outline lists Potential Complement 1 as 动词+得/不+动词/形容词. This complement indicates whether an action can reach a result under the relevant conditions, including the agent’s ability and available time or resources. The agent need not be the speaker.
A resultative combination names an action and its result, as in 买到 or 洗干净. It does not by itself assert that the event has already happened: 看完再走 is an instruction about what to do before leaving. Inserting 得 or 不 gives the potential forms 买得到/买不到 and 洗得干净/洗不干净. Here 得 and unstressed 不 are normally pronounced with a neutral tone.
Formation: Affirmative, Negative, and Questions
The syllabus groups result verbs and result adjectives together in this structure because they follow identical word-order rules. The main verb names the action being attempted, and the second element—either a verb like 完 (wán, finish), 到 (dào, reach/obtain), 懂 (dǒng, understand), 起 (qǐ, afford) or an adjective like 清楚 (qīngchu, clear), 干净 (gānjìng, clean), 饱 (bǎo, full)—names the result.
In natural everyday Chinese, the negative form with 不 is far more common in declarative statements. Speakers frequently use it to explain why a goal cannot be met. The affirmative form with 得 is most often used to answer a question, reassure someone, or contrast with a negative expectation.
电影票太贵了，我买不起。
Uses the verb 起 (qǐ) after 买不 (mǎi bu) as a fixed potential complement meaning 'cannot afford to buy'.
今天的工作不多，我做得完。
Affirmative potential complement with the result verb 完 (wán, finish), reassuring the listener that the workload is manageable.
请坐前边，这儿看得清楚黑板。
Uses the result adjective 清楚 (qīngchu, clear) with the direct object 黑板 (hēibǎn, blackboard) placed after the complete potential complement.
这件白衬衫洗不干净了。
The object 这件白衬衫 (zhè jiàn bái chènshān) is placed at the front as the topic, followed by the negative potential complement 洗不干净 (xǐ bu gānjìng).
To ask whether a result is achievable, you can add the question particle 吗 (ma) to the end of an affirmative potential sentence, or juxtapose the affirmative and negative forms to create an A-not-A question.
老师说话很快，你听得懂听不懂？
Forms an A-not-A question by pairing the affirmative 听得懂 (tīng de dǒng) and the negative 听不懂 (tīng bu dǒng).
Sentence Role, Object Placement, and Restrictions
Inside a clause, the combination of Verb + 得/不 + Verb/Adjective acts as a single tightly bound predicate unit. Because the complement is directly attached to the verb through 得 or 不, nothing else may be inserted inside this sequence.
- Object placement: If the verb takes a direct object, the object must stand either after the entire potential complement or at the beginning of the sentence/clause as a topic. Moving the object to the front is especially natural when the object is known or definite.
- No internal splitting: Never place a noun object between the main verb and 得/不, or between 得/不 and the result element.
- No double negation: Because 不 is already built into the negative potential complement, you cannot place another 不 or 没 (méi) directly before the verb to negate the action (unless creating a deliberate rhetorical double negative in advanced contexts). Similarly, aspect particles like 了 (le) and 过 (guò) cannot be inserted inside the potential complement.
× 我买不票到。
The intended word order is 我买不到票: the object 票 follows 买不到, rather than separating 不 from 到.
Corrected example: 我买不到票。
我买不到票。
The object 票 follows the whole potential form 买不到.
Distinguishing Potential Complements from Neighbouring Structures
Learners often confuse potential complements with three closely related structures: resultative complements, state/degree complements that also use 得, and the modal verb 能 (néng). Paying attention to what kind of question or negation a sentence uses will immediately clarify which complement is at work.
- Resultative vs. potential: 我没买到票 reports an unsuccessful purchase attempt in its context; 我买不到票 says that obtaining tickets is not possible under the relevant conditions. The bare combination 买到 names reaching the result, and its time or reality status comes from the sentence: 明天一定要买到票 expresses a future goal.
- Potential and state/degree complements can share the written form 做得好. For a habitual or actual performance, 做得不好 describes poor performance and 做得很好 describes good performance to a high degree. For attainability, 做得好 means “can do it well”, with 做不好 as its negative. Do not insert 很 inside this potential form; interpret the full context to distinguish the readings.
- 能 and 可以 can express ability or circumstantial possibility, and in suitable contexts permission; they are not general markers of willingness. Potential complements make a particular result explicit: 做不完 means “cannot finish”, not merely “cannot do”. 能完成 and 做得完 may overlap in meaning. 能做得完 is possible too. For a basic negative about an unattainable result, learn 做不完 rather than mechanically putting 不能 before 做得完.
Frequently asked questions
How is 得 pronounced in a potential complement?
In a potential complement, 得 is always pronounced de in the neutral tone, not dé (to obtain) or děi (must).
Can I use 能 (néng) together with a potential complement?
Yes, in affirmative sentences and questions, speakers often place 能 before a potential complement (for example, 能做得完) to emphasize capability. However, in ordinary negative statements about failing to reach a result, use the negative potential complement alone (做不完) rather than putting 不能 before an affirmative potential complement.
Is there any grammar difference between using a verb or an adjective after 得/不?
No. In this structure, both resultative verbs (like 完, 到, 懂) and resultative adjectives (like 清楚, 干净, 饱) occupy the exact same slot after 得/不 and follow the same rules for object placement and question formation.
