A2 Intermediate Quantities & Measures

How to Say “Half” with 半 (bàn)

半 (bàn) means “half,” and the whole trick is WHERE it sits. Before the measure word = “half a …”: 半个小时 (half an hour). After the measure word, with a number = “… and a half”: 一个半小时 (an hour and a half). Time words 天 and 年 take 半 directly — 半天, 半年.

Why this trips learners up

半 (bàn) is simply “half,” but it behaves like a number, so it tangles with measure words — and its position changes the amount completely. To say “half a …”, put 半 before the measure word: 半 + measure word + noun — 半个小时 (“half an hour”), 半碗饭 (“half a bowl of rice”), 半瓶牛奶 (“half a bottle of milk”).

To say “… and a half”, put a number in front and move 半 after the measure word: Number + measure word + 半 + noun — 一个半小时 (“an hour and a half”), 两个半月 (“two and a half months”), 三碗半饭 (“three and a half bowls of rice”). It’s the same logic as English “half an hour” vs “an hour and a half” — just with measure words to place. So 半个 vs 个半 is the whole game.

Because 半 acts like a number, it needs a measure word before an ordinary noun: 半个西瓜 (“half a watermelon”), not 半西瓜. And just like with 每, the self-measure words 天 (day) and 年 (year) take 半 directly, with no 个: 半天, 半年 — and 两天半, 一年半. Saying 半个天 is wrong.

One nice idiom: 半天 literally means “half a day,” but in speech it often just means “a long while” — 我找了半天 = “I searched for ages.”

The structure

半 bàn Measure wordObject

Colour key

Each colour marks one grammatical role — and the same colour means the same role on every page in the Lab.

Pattern Subject Verb Object Place Adverb Function word Measure word

Examples in context

Real-world sentences, easiest first. Toggle pinyin or the translation, tap any word to see its role, or play the audio.

Tap a word to see its grammatical role.

wǒ 我 Subject zhǐ 只 Adverb xiǎng 想 Function word hē 喝 Verb bàn 半 Pattern bēi 杯 Measure word kāfēi 咖啡 Object

I only want half a cup of coffee (半 + 杯).

tā 他 Subject lái 来 Verb zhōngguó 中国 Place bàn 半 Pattern nián 年 Measure word le 了 Function word

He’s been in China for half a year (半年 — 年 takes no 个).

wǒ yí gè rén 我一个人 Subject chī 吃 Verb le 了 Function word bàn 半 Pattern gè 个 Measure word xīguā 西瓜 Object

I ate half a watermelon by myself (半个西瓜).

wǒmen 我们 Subject zài shān shàng 在山上 Place zǒu 走 Verb le 了 Function word liǎng gè 两个 Measure word bàn 半 Pattern xiǎoshí 小时 Object

We walked two and a half hours on the mountain (两个半 — 半 after the measure word).

wǒ 我 Subject xué 学 Verb zhōngwén 中文 Object yǐjīng 已经 Adverb yì nián 一年 Measure word bàn 半 Pattern le 了 Function word

I’ve been studying Chinese for a year and a half now (一年半 — 半 after 年).

bīngxiāng lǐ 冰箱里 Place hái 还 Adverb shèng 剩 Verb bàn 半 Pattern píng 瓶 Measure word niúnǎi 牛奶 Object

There’s half a bottle of milk left in the fridge (半瓶).

wǒ 我 Subject zhǎo 找 Verb le 了 Function word bàn 半 Pattern tiān 天 Measure word cái 才 Adverb zhǎodào 找到 Verb yàoshi 钥匙 Object

I searched for ages before I found the keys (半天 — literally “half a day,” here “a long while”).

zhège xiàngmù 这个项目 Object wǒmen 我们 Subject yòng 用 Verb le 了 Function word sān tiān 三天 Measure word bàn 半 Pattern jiù 就 Adverb wánchéng 完成 Verb le 了 Function word

We finished this project in just three and a half days (三天半 — Number + 天 + 半).

Common mistakes

Avoid: 电影演了半个小时。 diànyǐng yǎn le bàn gè xiǎoshí.

Say this: 电影演了一个半小时。 diànyǐng yǎn le yí gè bàn xiǎoshí.

Why it happens: Position flips the amount. 半个小时 = “half an hour”; “an hour and a half” moves 半 after the measure word with a number in front — 一个半小时. 半个 (half of one) vs 个半 (one and a half).

Avoid: 我睡了半个天。 wǒ shuì le bàn gè tiān.

Say this: 我睡了半天。 wǒ shuì le bàntiān.

Why it happens: 天 and 年 are their own measure words, so 半 attaches directly — 半天, 半年 — never 半个天 / 半个年. (Same rule as 每天 on the “every” page.)

Avoid: 我吃了半西瓜。 wǒ chī le bàn xīguā.

Say this: 我吃了半个西瓜。 wǒ chī le bàn gè xīguā.

Why it happens: 半 acts like a number, so it needs a measure word before an ordinary noun: 半个西瓜, 半杯水, 半碗饭 — not 半西瓜. (The exceptions are the self-measure words 半天, 半年.)

Compare & contrast

半 + measure word — half a … (半个)	Number + MW + 半 — … and a half (个半)	The difference
半个小时bàn gè xiǎoshí	一个半小时yí gè bàn xiǎoshí	半个小时 = “half an hour” (半 before the measure word). 一个半小时 = “an hour and a half” (半 after it, number in front). One character moves; the amount changes.
半年bàn nián	一年半yì nián bàn	半年 = “half a year”; 一年半 = “a year and a half.” The self-measure word 年 follows the same before/after rule.

Rule of thumbPosition is everything. 半 BEFORE the measure word = “half a …” (半个小时, 半碗饭). 半 AFTER the measure word, with a number in front = “… and a half” (一个半小时, 三碗半饭). And the self-measure words 天/年 skip 个: 半天, 一年半.

Try it yourself

Say “I drank half a glass of water.” — 半 before the measure word, then the noun.

Related patterns

Quick reference card

How to Say “Half” with 半 (bàn) grammar.merrymandarin.com

A pocket summary — print it and keep it by your desk.

Structure

半 + Measure word + Object

Example

我只想喝半杯咖啡

I only want half a cup of coffee (半 + 杯).

Watch out

✗ 电影演了半个小时。 → ✓ 电影演了一个半小时。