Potential Complements 可能补语 | Chinese (Mandarin) Grammar

The potential complement (可能补语) is Mandarin's built-in "can / can't," and it lives inside the verb–result unit rather than in front of it. Take any verb-plus-complement pair — 看懂 "read-and-grasp," 吃完 "eat-and-finish" — and slip 得 (de, "able") or 不 (bu, "unable") into the seam: 看得懂 "can understand," 看不懂 "can't understand," 吃得完 "can finish," 吃不完 "can't finish." English has no single word for this — we scatter it across "can," "manage to," "be able to." Chinese welds it straight onto the action, and, crucially, the negative form is the one you will hear ten times for every affirmative.

Where 得 and 不 go

The frame is fixed: verb + 得/不 + complement. 得 (here toneless de, not fourth-tone dé) marks the affirmative "the result can be reached"; 不 (toneless bu) marks the negative "the result cannot be reached." You are not adding a new word so much as prying the two halves of an existing resultative or directional pair apart and dropping in the hinge.

这本书太难了，我看不懂。

zhè běn shū tài nán le, wǒ kàn bu dǒng

This book is too hard — I can't understand it. (neutral) — 看 + 不 + 懂.

外面很吵，你听得见我说话吗？

wàimiàn hěn chǎo, nǐ tīng de jiàn wǒ shuō huà ma?

It's noisy outside — can you hear me talking? (informal) — the affirmative 听得见 in a question.

这么多菜，我们两个人吃不完。

zhème duō cài, wǒmen liǎng ge rén chī bu wán

This much food — the two of us can't finish it. (informal)

The affirmative is rare — the negative rules

This is a genuine quirk worth stating plainly. In everyday speech the negative V不C ("can't pull off X") is extremely common, but the affirmative V得C ("can pull off X") is comparatively rare. It mostly surfaces in questions (听得懂吗？) and in short answers to them (听得懂 / 听不懂). To make a plain positive claim of ability out of the blue, speakers usually reach for the modal 能 or 可以 instead. So 你听得懂吗？——听得懂 is idiomatic, but a bare 我听得懂 as a stand-alone assertion sounds less natural than 我能听懂.

你听得懂上海话吗？——听不懂。

nǐ tīng de dǒng Shànghǎihuà ma? — tīng bu dǒng

Can you understand Shanghainese? — No, I can't. (informal) — affirmative in the question, negative in the answer.

这些字你看得清看不清？

zhè xiē zì nǐ kàn de qīng kàn bu qīng?

Can you make out these characters or not? (informal) — the V得C V不C question shape.

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The affirmative loves the "positive-negative" question: 你看得懂看不懂？ ("Can you read it or not?"). Stacking V得C directly against V不C is one of the most native-sounding uses of the affirmative — and it neatly sidesteps needing a separate word for "or."

Where the object goes — after the whole block

The object does not squeeze between 不 and the complement. It follows the complete verb-得/不-complement block. So "I can't understand Chinese" is 我听不懂中文 (verb 听 + 不 + result 懂 + object 中文) — never ✗我听中文不懂. Alternatively you can topicalize the object to the front: 中文我听不懂. Both are common; what you cannot do is split the object into the middle.

我听不懂中文。

wǒ tīng bu dǒng Zhōngwén

I can't understand Chinese. (neutral) — object 中文 sits AFTER the whole 听不懂.

他看得懂日文报纸。

tā kàn de dǒng Rìwén bàozhǐ

He can read Japanese newspapers. (neutral) — object follows 看得懂.

这么小的声音，我听不见你。

zhème xiǎo de shēngyīn, wǒ tīng bu jiàn nǐ

Your voice is so quiet — I can't hear you. (informal)

Potential vs 没 (didn't) and vs 能 (able to)

Two neighbours to keep sharply apart. 没 negates a realized outcome on a specific occasion: 这本书我没看懂 = "I didn't understand this book (this time)." The potential 看不懂 = "I can't understand it (I lack the ability, no matter how I try)." One is a failed event; the other is a standing inability — see negating resultatives with 没. 能 (néng) is the broad modal "be able / be allowed to"; for a raw physical or perceptual "can I achieve this result," the potential is the more idiomatic tool, and the fine line gets its own page: potential vs 能.

这本书我没看懂。

zhè běn shū wǒ méi kàn dǒng

I didn't understand this book (this time I read it). (neutral) — a failed event: 没.

这本书我看不懂。

zhè běn shū wǒ kàn bu dǒng

I can't understand this book (it's beyond me). (neutral) — a standing inability: 看不懂.

Common Mistakes

1. Using 不能 or a plain 不 instead of V不C. For "can't achieve the result," the potential is the natural form, not a modal.

❌ 我不能听懂中文。

Unnatural — for inability to grasp the result, use the potential.

✅ 我听不懂中文。

wǒ tīng bu dǒng Zhōngwén

I can't understand Chinese.

2. Pushing the object into the middle. The object never sits between the verb and the complement.

❌ 我听中文不懂。

Incorrect — the object can't split the 听…懂 unit.

✅ 我听不懂中文。

wǒ tīng bu dǒng Zhōngwén

I can't understand Chinese. — object after the whole block (or topicalized: 中文我听不懂).

3. Writing 的 or 地 for the potential marker. The infix is 得, always.

❌ 我看的懂这本书。

Incorrect — the potential marker is 得, not 的.

✅ 我看得懂这本书。

wǒ kàn de dǒng zhè běn shū

I can read this book.

4. Reaching for 没 when you mean a standing inability. 没看懂 only denies one occasion; it does not say "unable."

❌ 这么深的古文，我没看懂。

Wrong nuance if you mean you're simply unable — this only says you didn't grasp it this once.

✅ 这么深的古文，我看不懂。

zhème shēn de gǔwén, wǒ kàn bu dǒng

Classical Chinese this deep is beyond me. — 看不懂 for the standing inability.

Key Takeaways

The potential complement inserts 得 (able) or 不 (unable) into a verb–complement pair: 看得懂 / 看不懂, 吃得完 / 吃不完. Both particles are toneless here.
It expresses inherent possibility — whether ability or circumstances let the result happen.
The negative V不C is by far the most common; the affirmative V得C mostly lives in questions and short answers.
The object follows the whole block (听不懂中文) or is topicalized (中文听不懂) — never inserted in the middle.
Keep it apart from 没 (a failed occasion: 没看懂) and from the modal 能 (broad ability/permission).

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Where 得 and 不 go

The affirmative is rare — the negative rules

Where the object goes — after the whole block

Potential vs 没 (didn't) and vs 能 (able to)

Common Mistakes

Key Takeaways

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