半A半B — Half … Half … | Chinese (Mandarin) Grammar

When English says "half A, half B," it usually means a thing has been cut in two — half the cake is chocolate, half is vanilla; two separate portions. Chinese 半A半B (bàn A bàn B) does something subtler and more interesting: it describes one and the same subject holding two states at once. In 半信半疑 you are not half-believing one thing and half-doubting another — you are believing and doubting the very same claim, both feelings alive together. That is why the closest English is not "50% of it" but "in two minds / half-hearted / half-and-half." The frame captures ambivalence, drowsiness, an in-between condition — the human experience of being pulled two ways at the same moment.

The shape

Two identical 半 (bàn, "half") bracket two single-character words, almost always opposites or complements:

半 + A + 半 + B

Like 不A 不B, the whole unit behaves as one adjective or adverb — it stands alone as a predicate, precedes a noun with 的, or modifies a verb with 地. Unlike a real fraction, the two 半 do not add up to a measured quantity; they signal that both qualities are present.

我把事情原原本本告诉他，他还是半信半疑。

wǒ bǎ shìqing yuányuánběnběn gàosu tā, tā háishì bàn xìn bàn yí

I told him the whole story from beginning to end, and he's still half-convinced. (informal) — believing and doubting the same account at once.

The core set

These are the high-frequency members. Learn them as whole words.

Idiom	Pinyin	Literal	Everyday sense
半信半疑	bàn xìn bàn yí	half believe half doubt	skeptical, only half-convinced
半推半就	bàn tuī bàn jiù	half push-away half go-along	yield with a show of reluctance
半梦半醒	bàn mèng bàn xǐng	half dreaming half awake	half asleep, in a daze
半新半旧	bàn xīn bàn jiù	half new half old	neither new nor worn out, a bit used
半真半假	bàn zhēn bàn jiǎ	half true half false	half in earnest, half joking
半明半暗	bàn míng bàn àn	half bright half dark	dim, half-lit

大家一劝，她半推半就地就上台唱了一首。

dàjiā yí quàn, tā bàn tuī bàn jiù de jiù shàng tái chàng le yì shǒu

With a little urging she put up token resistance, then went up and sang one. (informal) — the classic 'protesting while agreeing' move.

闹钟响的时候我还半梦半醒，随手就按掉了。

nàozhōng xiǎng de shíhou wǒ hái bàn mèng bàn xǐng, suíshǒu jiù àn diào le

When the alarm went off I was still half asleep and just swatted it off. (informal)

他穿着一件半新半旧的外套，洗得有点发白。

tā chuānzhe yí jiàn bàn xīn bàn jiù de wàitào, xǐ de yǒudiǎn fābái

He wore a coat that's neither new nor worn out, washed a little pale. (neutral)

别信他，他那话半真半假的，你自己判断。

bié xìn tā, tā nà huà bàn zhēn bàn jiǎ de, nǐ zìjǐ pànduàn

Don't take him at his word — what he says is half true, half joking; judge for yourself. (informal)

💡

半推半就 is worth owning: it names a very specific social choreography — protesting on the surface while cooperating underneath. You accept the second helping, the invitation, the gift, but only after a ritual "oh no, I couldn't." English needs a whole sentence for it; Chinese has one tidy idiom.

It is not the number 半

The single biggest misreading is treating 半 as the ordinary numeral "half" quantifying a noun, the way it works in 半个小时 (bàn ge xiǎoshí, "half an hour") or 半杯水 (bàn bēi shuǐ, "half a glass of water"). In those, 半 counts a measurable amount. Inside 半A半B it does not count anything — 半信 is not "half a belief," it is "believing-halfway." The frame is a fixed adverbial idiom, and the two halves are attitudes or states, not measured portions.

我等了半个小时，他才半信半疑地来了。

wǒ děng le bàn ge xiǎoshí, tā cái bàn xìn bàn yí de lái le

I waited half an hour, and only then did he come, still half-doubting. (informal) — 半个小时 counts time; 半信半疑 describes a state.

The 半A不B variant

A common sibling swaps the second 半 for 不, giving 半A不B — "half A, not quite B." The most frequent is 半死不活 (bàn sǐ bù huó, "half dead not alive") = listless, more dead than alive, and 半懂不懂 (bàn dǒng bù dǒng, "half understand not understand") = only half-following. The nuance is a touch more negative than plain 半A半B: something is stuck short of the fuller state B.

病了一场，他到现在还半死不活的，什么都不想干。

bìng le yì chǎng, tā dào xiànzài hái bàn sǐ bù huó de, shénme dōu bù xiǎng gàn

After that spell of illness he's still more dead than alive — doesn't want to do a thing. (informal)

老师讲的我半懂不懂，下课又去问了同学。

lǎoshī jiǎng de wǒ bàn dǒng bù dǒng, xiàkè yòu qù wèn le tóngxué

I only half-followed what the teacher said, so after class I went and asked a classmate. (informal)

Against 不A不B, and a look at 三心二意

Keep the sister frames straight. 不A不B denies both poles: 不冷不热 = at neither extreme, so in the middle. 半A半B asserts both at once: 半信半疑 = believing and doubting together. Deny-both versus assert-both.

There is also a character-trait chengyu that hovers nearby: 三心二意 (sān xīn èr yì, "three hearts, two minds"), which describes a person who is chronically wavering, half-hearted, unable to commit. The difference is scope. 半A半B labels a momentary, situational state — you happen to be half asleep right now, half-convinced by this claim. 三心二意 labels a standing disposition — that person is always dithering. For that family of person-describing idioms, see chengyu for describing people.

房间半明半暗，他就着窗外的路灯看书。

fángjiān bàn míng bàn àn, tā jiùzhe chuāng wài de lùdēng kàn shū

The room was half-lit, and he read by the streetlight through the window. (literary)

Common Mistakes

1. Reading 半 as a fraction of a noun. In this frame 半 does not count anything; 半信半疑 is "believing-halfway," not "half a belief."

❌ 他给了我半信半疑。（当成「半个」用）

Wrong — 半信半疑 isn't a countable thing you 'give'; it describes a state of mind. Use it adjectivally: 他半信半疑地看着我.

✅ 他半信半疑地看着我。

tā bàn xìn bàn yí de kànzhe wǒ

He looked at me half-doubtingly. — the idiom as an adverbial with 地.

2. Attaching a direct object as if it were a transitive verb. English "I half-believe the news" is transitive; the Chinese idiom is stative — route the object through 对.

❌ 我半信半疑这个消息。

Wrong — the idiom can't take a direct object; use 对: 我对这个消息半信半疑.

✅ 我对这个消息半信半疑。

wǒ duì zhège xiāoxi bàn xìn bàn yí

I'm only half-convinced by this news. — the object rides on 对.

3. Confusing it with 不A不B. 半 asserts both states; 不 denies both. Swapping them flips the meaning.

❌ 天气半冷半热。（想说「不冷不热」）

Odd — for 'pleasantly mild, at neither extreme' you deny both poles: 不冷不热, not 半冷半热.

✅ 天气不冷不热，正舒服。

tiānqì bù lěng bú rè, zhèng shūfu

The weather's pleasantly mild, just comfortable. — 不A不B for 'in the middle'.

4. Inserting 是. The frame is adjectival — it takes no 是.

❌ 他的态度是半推半就。

Wrong — drop the 是: 他的态度半推半就 or 他半推半就地答应了.

✅ 他半推半就地答应了。

tā bàn tuī bàn jiù de dāying le

He agreed after a token show of reluctance. — no 是.

Key Takeaways

半A半B asserts two states at once in one subject — the feeling is "in two minds / half-hearted," not a measured fraction.
A and B are usually opposites or complements; the whole is one adjective/adverb (stands alone, +的 before a noun, +地 before a verb).
Core set: 半信半疑, 半推半就, 半梦半醒, 半新半旧, 半真半假, 半明半暗 — memorise as whole words.
The 半A不B variant (半死不活, 半懂不懂) means "half A, not quite B," leaning negative.
Do not read 半 as the numeral: 半信 ≠ "half a belief," but 半个小时 = "half an hour."
It is the mirror of 不A不B (assert-both vs deny-both), and it names a passing state, unlike the standing trait 三心二意.

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