只 (zhī) does two jobs. First, it is the default measure word for animals — cats, birds, chickens, rabbits, tigers, most creatures you'll ever name take 只. Second, it counts one member of a natural pair — one hand, one eye, one shoe, one glove — the "just one of two" word. English has no single classifier that does either job, so 只 is pure new grammar to acquire. One warning before anything else: this measure word is read zhī (first tone). The identical character 只 also writes the common adverb zhǐ (third tone, "only") — a completely different word. Same shape on the page, two readings, two meanings.
The default animal classifier
Reach for 只 whenever you talk about an animal and don't have a more specific classifier in mind. It covers the vast majority of creatures:
| Noun | With 只 | Meaning |
|---|---|---|
| 猫 (māo) | 一只猫 (yì zhī māo) | a cat |
| 鸟 (niǎo) | 三只鸟 (sān zhī niǎo) | three birds |
| 鸡 (jī) | 一只鸡 (yì zhī jī) | a chicken |
| 兔子 (tùzi) | 一只兔子 (yì zhī tùzi) | a rabbit |
| 老虎 (lǎohǔ) | 一只老虎 (yì zhī lǎohǔ) | a tiger |
| 熊猫 (xióngmāo) | 一只熊猫 (yì zhī xióngmāo) | a panda |
| 蚂蚁 (mǎyǐ) | 一只蚂蚁 (yì zhī mǎyǐ) | an ant |
| 手 (shǒu) | 一只手 (yì zhī shǒu) | one hand |
我家养了一只猫和两只鸟。
wǒ jiā yǎng le yì zhī māo hé liǎng zhī niǎo
We have a cat and two birds at home. (informal) — 只 is the default for both.
树上有一只鸟在唱歌。
shù shang yǒu yì zhī niǎo zài chànggē
There's a bird singing in the tree. (informal) — birds take 只.
动物园里那只大熊猫在睡觉。
dòngwùyuán li nà zhī dà xióngmāo zài shuìjiào
That giant panda at the zoo is sleeping. (neutral) — pandas take 只.
When animals are NOT 只 — the honest exceptions
"只 for animals" is a strong default, not an absolute law, and pretending otherwise would mislead you. Two groups break away:
Large livestock take their own classifiers. A horse is 一匹马 (yì pǐ mǎ), a cow or ox is 一头牛 (yì tóu niú), a pig is 一头猪 (yì tóu zhū). These are simply memorised — 匹 (pǐ) for horses, 头 (tóu, literally "head") for big four-legged livestock.
Elongated animals take 条. Fish and snakes are firmly 一条鱼 / 一条蛇 (see 条 for long-thin things). Dogs straddle the line: both 一只狗 and 一条狗 are correct, with 只 very common in everyday speech.
农场里有三头牛和一匹马。
nóngchǎng li yǒu sān tóu niú hé yì pǐ mǎ
There are three cows and a horse on the farm. (neutral) — big livestock take 头 and 匹, not 只.
他们家有一只狗，叫小白。
tāmen jiā yǒu yì zhī gǒu, jiào Xiǎobái
They have a dog called Xiaobai. (informal) — dogs commonly take 只; 一条狗 is also fine.
There is no shortcut that predicts 匹/头/条 from the animal's meaning — you memorise the short list of exceptions and let 只 catch everything else.
The "one of a pair" job
The second life of 只 is counting a single member of something that naturally comes in twos — paired body parts and paired objects. One hand, one eye, one ear, one foot; one shoe, one sock, one glove, one chopstick:
我一只手拿不动，太重了。
wǒ yì zhī shǒu ná bú dòng, tài zhòng le
I can't lift it with one hand, it's too heavy. (informal) — 一只手 = one of the two hands.
他一只眼睛看不清楚。
tā yì zhī yǎnjing kàn bù qīngchu
He can't see clearly out of one eye. (neutral) — one of the paired eyes: 只.
床底下只有一只鞋，另一只呢？
chuáng dǐxia zhǐ yǒu yì zhī xié, lìng yì zhī ne?
There's only one shoe under the bed — where's the other one? (informal) — 一只鞋 = one shoe of the pair. Note 只 (zhī, the classifier) sitting right next to 只 (zhǐ, 'only').
That last example is deliberate: 只有 (zhǐ yǒu, "there is only") and 一只鞋 (yì zhī xié, "one shoe") put both readings of 只 in one sentence — the adverb zhǐ and the classifier zhī. Same character, and a native reader disambiguates purely from grammatical position.
When you want the whole pair rather than one half, you switch to the pair classifiers 双 (shuāng) or 对 (duì): 一双鞋 (yì shuāng xié, "a pair of shoes"), 一双手套 (yì shuāng shǒutào, "a pair of gloves"). So a single glove is 一只手套, and the pair is 一双手套 (see 双 vs 对).
我丢了一只袜子，现在只剩一双半。
wǒ diū le yì zhī wàzi, xiànzài zhǐ shèng yì shuāng bàn
I lost one sock, so now I've only got a pair and a half. (informal) — 只 for the single lost sock, 双 for the surviving pairs.
Contrast with 个 — and with zhǐ 'only'
Versus 个: using the general 个 for animals or paired parts (一个猫, 一个手) is a classic beginner tell. 个 is understood but clearly childish-sounding for 只 nouns; the specific classifier is worth the small effort.
Versus zhǐ 'only': this is a reading trap, not a usage trap, but it matters for reading aloud and for listening. Compare:
| Written | Reading | Meaning |
|---|---|---|
| 一只猫 | yì zhī māo | one cat (只 = classifier) |
| 只有一个 | zhǐ yǒu yí ge | there's only one (只 = 'only') |
The rule of thumb: 只 directly after a number is the animal/pair classifier zhī; 只 in front of a verb or at the head of a clause is the adverb zhǐ "only."
Common Mistakes
1. Using 个 for animals. Cats, birds and the like take 只, not 个.
❌ 我看见一个猫。
Incorrect — animals take 只: 一只猫.
✅ 我看见一只猫。
wǒ kànjiàn yì zhī māo
I saw a cat. — 只 for the animal.
2. Using 只 for a fish or snake. These elongated animals defect to 条; 只 is wrong for them.
❌ 我买了两只鱼。
Incorrect — fish take 条: 两条鱼.
✅ 我买了两条鱼。
wǒ mǎi le liǎng tiáo yú
I bought two fish. — 条 for fish.
3. Using 只 (one of a pair) when you mean the whole pair. One shoe is 一只鞋; the pair is 一双鞋.
❌ 我买了一只新鞋。（meaning a pair）
Mismatch — 一只鞋 is a single shoe; a pair is 一双鞋.
✅ 我买了一双新鞋。
wǒ mǎi le yì shuāng xīn xié
I bought a new pair of shoes. — 双 for the pair, 只 for one of them.
4. Reading the classifier 只 as zhǐ. After a number, 只 is zhī; the zhǐ reading is the separate word "only."
✅ 天上有几只鸟？
tiān shàng yǒu jǐ zhī niǎo?
How many birds are in the sky? — 几只 is jǐ zhī, never jǐ zhǐ.
Key Takeaways
- 只 (zhī) is the default animal classifier — 猫, 鸟, 鸡, 兔子, 老虎, 熊猫, 蚂蚁 and most creatures.
- Exceptions to memorise: large livestock take 头 (牛, 猪) or 匹 (马); elongated fish and snakes take 条; dogs take either 只 or 条.
- 只 also counts one member of a natural pair — 一只手, 一只眼睛, 一只鞋; the whole pair switches to 双 / 对 (一双鞋).
- Read it zhī (first tone). The same character 只 as zhǐ (third tone) is the unrelated adverb "only" — position tells them apart: after a number → zhī; before a verb → zhǐ.
- Don't fall back on 个 for animals or paired parts; it's understood but marks you as a beginner.
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- 条 (Long & Thin)HSK 1 — 条 (tiáo) is the measure word for long, thin, flexible or winding things — fish, roads, rivers, trousers, scarves, snakes, dogs and even a piece of news: 一条鱼, 一条路, 一条裤子.
- 双 vs 对 (Pairs)HSK 3 — Both 双 (shuāng) and 对 (duì) mean 'a pair', but 双 counts matched pairs of the SAME item — 一双鞋, 一双筷子, 一双手 — while 对 counts complementary couples that form a set — 一对夫妻, 一对耳环, 一对双胞胎.
- Choosing the Right ClassifierHSK 2 — A decision procedure for picking the right Chinese measure word: default to 个 when stuck, otherwise match the noun by shape, category, or the respect it deserves — plus a reference table of the ~15 classifiers that cover most everyday nouns.
- The Default 个HSK 1 — 个 (gè, usually neutral-toned ge) is the general-purpose measure word — the safe fallback when you don't know the specific classifier — and it correctly covers people, many everyday objects, and abstract nouns; the goal is to graduate to specific classifiers while keeping 个 for the nouns that genuinely take it.