Kilo Lingo
Mandarin grammar Part of Chapter 24

CEFR B1-B2

4 min read

Test yourself (18 questions)

Mandarin Four-Character Idioms: The Patterns Behind Them

By Michael McGettrick and Wee Khang LinUpdated 12 October 2026

A four-character idiom is one word, four syllables long. Learn two shapes, AABB (干净, gāngānjìngjìng) and ABAC (, yìxīnyíyì), and you can read many you have never met. Then learn the one rule for using them: nothing goes inside the block, and the particles attach outside it.

Quick check

Three quick questions on what you have just read. The full practice is further down.

Spot the mistake

0/3

Each sentence has one mistake. Tap it.

  1. fáng jiān hěn gān gān jìng jìng de 。

  2. tā de fáng jiān luàn bā qī zāo 。

  3. wǒ bù hǎo hěn yì si 。

The whole system on one screen

The colours stay the same all page long:

the four-character blockthe particle outside itWhat do the colours mean?
HanziPinyinEnglish
干gān净jìng。Fángjiān gāngānjìngjìng de.The room is spotless
兴xīng。Tā gāogāoxìngxìng de zǒu le.He left happily
样yànggèzhǒnggèyàng de dōngxiall sorts of things
干gān净jìng。Tā bǎ fángjiān dǎsǎo de gāngānjìngjìng.He cleaned the room spotless
ShapeHanziPinyinEnglish
AABB干gān净jìnggāngānjìngjìngspotless
ABACyìxīnyíyìwholeheartedly
neitherluànqībāzāoa complete mess

Pinyin on this page writes each idiom as one word. AABB forms are written with full tones; in speech the second syllable is often lighter.

AABB: doubling a two-syllable adjective

the doubled syllableWhat do the colours mean?

Take a two-syllable adjective, AB, and say each syllable twice: AABB. The doubled form is more vivid than the plain one:

干净 gānjìng, clean → 干干净净 gāngānjìngjìng, spotless
HanziPinyinEnglish
干gān净jìnggāngānjìngjìngspotless (from , clean)
兴xīnggāogāoxìngxìngcheerfully (from , happy)
清qīng楚chǔqīngqīngchǔchǔcrystal clear (from , clear)
虎hǔmǎmǎhūhūso-so (from , careless)

Two habits come with the doubling. It takes no (hěn), because the doubling already is the emphasis. And as a predicate it usually ends in (de):

  • 干gān净jìng。 (Fángjiān gāngānjìngjìng de.) - The room is spotless.
  • 。 (Fángjiān hěn gānjìng.) - The room is clean.

Not every adjective doubles: (zhòngyào), important, has no AABB form.

ABAC: the frame idioms

the frame (the repeated character)What do the colours mean?

The same character sits in slots one and three. Slots two and four hold a matched pair, usually two words that mean nearly the same thing:

HanziPinyinEnglish
yìxīnyíyìwholeheartedly (, : both "mind")
样yànggèzhǒnggèyàngall sorts of (, 样yàng: both "kind")
言yán语yǔzìyánzìyǔtalk to yourself (言yán, 语yǔ: both "speech")
缘yuánwúyuánwúgùfor no reason at all (缘yuán, : "cause")
bànxìnbànyíhalf believing, half doubting (, )

So when you meet a new ABAC idiom, look at the pair in slots two and four: the meaning is usually the two of them together. The last row is the other kind of pair: two opposites. Note the (yī) of : yì before a first tone, yí before a fourth.

Frozen: nothing goes inside

the four-character blockthe particle outside itWhat do the colours mean?

The four characters never change. Whatever you want to add goes before or after the whole block:

WrongRightWhy
。。 (hěn) goes outside the block
the order never changes
样yàng样yàngthe order never changes

Some blocks that work like adjectives, (bùhǎoyìsi) among them, can take (hěn) in front; a doubled AABB form never does. Other fixed blocks fit neither shape and are simply learnt whole:

HanziPinyinEnglish
luànqībāzāoa complete mess
bùhǎoyìsisorry; embarrassed
wúlùnrúhéwhatever happens, in any case

The (qī) and (bā) of count nothing: they turn up together in other "all over the place" phrases too, such as (qīshàngbāxià), on edge.

Where the block goes in a sentence

the four-character blockthe particle outside itWhat do the colours mean?

A block goes where an adjective or an adverb would, with the same particles:

HanziPinyinEnglish
。Tā de fángjiān luànqībāzāo.His room is a mess (nothing needed)
。Tā yìxīnyíyì de xuéxí.He studies wholeheartedly ( before a verb)
样yàng。Diàn li yǒu gèzhǒnggèyàng de dōngxi.The shop has all sorts ( before a noun)
干gān净jìng。Tā bǎ fángjiān dǎsǎo de gāngānjìngjìng.He cleaned it spotless ( after a verb)
，。Wúlùnrúhé, wǒ dōu yào qù.Whatever happens, I'm going

All three particles are pronounced de. Before a verb, (de) often drops after a doubled form: 兴xīng。 (Tā gāogāoxìngxìng zǒu le.) is fine too. (wúlùnrúhé) opens the sentence and takes (dōu) or (yě) before the verb.

Which ones you can say

Everyday speechMostly written
  1. 不好意思 bùhǎoyìsi: sorry
  2. 马马虎虎 mǎmǎhūhū: so-so
  3. 无论如何 wúlùnrúhé: in any case
  4. 画蛇添足 huàshétiānzú: overdoing it

Written Chinese uses idioms constantly. Speech uses a smaller set, and a learner who scatters literary 语 (chéngyǔ) into a chat about lunch sounds as if they are reciting. Say the ones you have heard people say; read the rest.

Mistakes English speakers make

WrongRightWhy
干gān净jìng。干gān净jìng。a doubled form takes no (hěn)
。。the order is frozen
虎hǔ。。a doubled form takes no (bù): negate (mǎhu)

What to do next

  1. Do the drill below.
  2. Double three adjectives you know into AABB, and check each in a dictionary.
  3. Then read the suffixes 性 (xìng) and 化 (huà), the other mark of written Mandarin.

Practise: test yourself

Sort into groups

0/6

Which shape is each idiom?

Tap a word, then the group it belongs in.

Build the word

0/2

Build the idiom from its pieces.

  1. spotless (干净, clean)

    spotless ( gān jìng , clean)

    Type pinyin or characters - tone marks optional

    Your word is empty.

  2. wholeheartedly (心 and 意, both mind)

    wholeheartedly ( xīn and yì , both mind)

    Type pinyin or characters - tone marks optional

    Your word is empty.

Complete the story

0/3

Choose the particle for each gap.

Saturday morning

星期六，我把房间打扫干干净净。妈妈回来了，高高兴兴说：“你的房间真干净！”下午我们去买了各种各样水果。

Gap 1 of 3

Spot the mistake

0/3

Each sentence has one mistake. Tap it.

  1. fáng jiān hěn gān gān jìng jìng de 。

  2. tā de fáng jiān luàn bā qī zāo 。

  3. wǒ bù hǎo hěn yì si 。

Matching

0/4

Match each idiom to its English.

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Frequently asked questions

What are four-character idioms in Mandarin?
Fixed four-syllable expressions that behave as single words. Some are classical 语 (chéngyǔ) such as 添 (huàshétiānzú), overdoing it; many are everyday shapes such as 干净 (gāngānjìngjìng), spotless, and (luànqībāzāo), a complete mess.
What is the AABB pattern in Mandarin?
A two-syllable adjective with each syllable doubled, which makes the description vivid: (gānjìng), clean, becomes 干净 (gāngānjìngjìng), spotless. The doubled form takes no (hěn), and as a predicate it usually ends in (de): 干净 (fángjiān gāngānjìngjìng de), the room is spotless.
What is the ABAC pattern in Chinese?
A frame: the same character in slots one and three, and a matched pair in slots two and four, usually near-synonyms. (yìxīnyíyì), wholeheartedly, pairs (xīn) and (yì), both 'mind'; 样 (gèzhǒnggèyàng), all sorts of, pairs (zhǒng) and 样 (yàng), both 'kind'.
Can I change a character in a four-character idiom?
No. They are frozen: (luànqībāzāo) cannot become , and (hěn) or (le) cannot go inside. Add what you need outside the block: 兴 (tā gāogāoxìngxìng de zǒu le), he left happily.
Do Chinese people use idioms when they speak?
Some, all the time: (bùhǎoyìsi), sorry, 虎 (mǎmǎhūhū), so-so, and (luànqībāzāo), a mess, are everyday speech. Literary 语 (chéngyǔ) belong more to writing and speeches. Use the ones you have heard people say.