前 / 后 (qián / hòu): In Front / Behind | Chinese (Mandarin) Grammar

前 (qián) and 后 (hòu) are a single pair of localizers that do double duty: in space they mean "front / in front of" and "back / behind," and in time they mean "before / ago" and "after / later." English splits this work across many words — front, ahead, before, ago versus back, behind, after, later — but Mandarin runs the whole spatial-and-temporal range through just 前 and 后. The one reframe to lock in: these words come after the noun or the event, never before it. "In front of the school" is literally school-front (学校前面); "after class" is class-after (下课后). If you catch yourself putting 前/后 first, English word order has leaked in.

Space: 前面 / 后面 after the noun

For physical location, the default full forms are the two-syllable 前面 (qiánmian) / 前边 (qiánbian) "front" and 后面 (hòumian) / 后边 (hòubian) "back, behind." They follow the noun that anchors them, and the whole phrase usually sits after 在 or 有.

学校前面有一个小公园。

xuéxiào qiánmian yǒu yí ge xiǎo gōngyuán

There's a little park in front of the school. (neutral) — 前面 comes after 学校.

我的车停在你家后面。

wǒ de chē tíng zài nǐ jiā hòumian

My car is parked behind your place. (informal)

站在我前面的那个人是谁？

zhàn zài wǒ qiánmian de nàge rén shì shéi?

Who's the person standing in front of me? (informal)

排在你后面的是我朋友。

pái zài nǐ hòumian de shì wǒ péngyou

The one queuing behind you is my friend. (informal)

Bare 前 and 后 without the suffix survive mainly in tight set phrases — 门前 (mén qián) "in front of the door," 面前 (miànqián) "in front of one's face," 背后 (bèihòu) "behind one's back." Elsewhere, use 前面/后面.

门前站着两个警察。

mén qián zhàn zhe liǎng ge jǐngchá

Two police officers are standing in front of the door. (neutral) — 门前 is a fixed bare-前 phrase.

💡

Don't confuse the localizer 前 "in front of (a place)" with the directional 往前走 (wǎng qián zǒu) "walk forward." The localizer marks a static position after a noun; 往前 marks a direction of motion. Same character, different job — see 往 (toward).

Time: 前 "ago / before," 后 "after / later"

The same pair marks time, and here the logic is identical to space: the time word or event comes first, then 前/后 closes it off. A duration + 前 means "that much time ago"; a duration + 后 means "that much time later." An event + 后 means "after that event."

三天前我就把作业交了。

sān tiān qián wǒ jiù bǎ zuòyè jiāo le

I turned in the homework three days ago. (informal)

五年前这里还是一片农田。

wǔ nián qián zhèlǐ háishì yí piàn nóngtián

Five years ago this was still farmland. (neutral)

下课后我们一起去吃饭吧。

xià kè hòu wǒmen yìqǐ qù chī fàn ba

Let's go grab something to eat after class. (informal)

毕业以后我想回老家工作。

bìyè yǐhòu wǒ xiǎng huí lǎojiā gōngzuò

After I graduate I want to go home and work. (neutral) — 以后 is the fuller 'after / afterward'.

The forms 以前 (yǐqián) "before / previously" and 以后 (yǐhòu) "after / from now on" are the elaborated versions used when there is no explicit duration, or to mean "in the past / in the future" on their own. 之前 (zhīqián) and 之后 (zhīhòu) are their slightly more written equivalents (neutral to formal).

我以后再也不熬夜了。

wǒ yǐhòu zài yě bù áoyè le

I'm never staying up late again. (informal) — 以后 standing alone means 'from now on'.

💡

Word order carries meaning: 三天前 (sān tiān qián) = "three days ago," but 前三天 (qián sān tiān) = "the first three days." Duration + 前 looks backward in time; 前 + duration counts from a start point. Flip the order and you flip the sense.

The pattern at a glance

Phrase	Reading	Sense
学校前面	xuéxiào qiánmian	in front of the school (space)
房子后面	fángzi hòumian	behind the house (space)
门前	mén qián	in front of the door (set phrase)
三天前	sān tiān qián	three days ago (time)
下课后	xià kè hòu	after class (time)
以后 / 以前	yǐhòu / yǐqián	afterward / previously (standalone time)

Common Mistakes

1. Fronting 前/后 English-style. "In front of the school" tempts learners to put the localizer first, but it must follow the noun.

❌ 前面学校有一个公园。

Incorrect — the localizer follows the noun: 学校前面.

✅ 学校前面有一个公园。

xuéxiào qiánmian yǒu yí ge gōngyuán

There's a park in front of the school.

2. Putting the event before 后 for "after." "After class" is 下课 + 后, not 后 + 下课.

❌ 后下课我们去吃饭。

Incorrect — the event comes first: 下课后.

✅ 下课后我们去吃饭。

xià kè hòu wǒmen qù chī fàn

After class we'll go eat.

3. Using bare 后 to mean "later / afterward." On its own, "later" needs 以后 (or 一会儿 for "in a bit") — bare 后 can't stand alone.

❌ 我后给你打电话。

Incorrect — standalone 'later' is 以后, not bare 后.

✅ 我以后给你打电话。

wǒ yǐhòu gěi nǐ dǎ diànhuà

I'll call you later.

4. Confusing 前三天 with 三天前. Duration + 前 = "ago"; 前 + duration = "the first N."

❌ 前三天我到的北京。

Marginal — this means 'the first three days', not 'three days ago'; use 三天前.

✅ 三天前我到的北京。

sān tiān qián wǒ dào de Běijīng

I arrived in Beijing three days ago.

Key Takeaways

前 (qián) and 后 (hòu) are one localizer pair covering both space ("in front of / behind") and time ("before-ago / after-later").
Spatial default is the two-syllable 前面 / 后面; bare 前/后 survive in set phrases like 门前, 面前, 背后.
For time, put the duration or event first: 三天前 "three days ago," 下课后 "after class"; use 以前 / 以后 when standing alone.
Everything comes after the noun or event — fronting them is the classic English-transfer error.
Watch the order: 三天前 "three days ago" ≠ 前三天 "the first three days."

Now practice Chinese

Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.

Start learning Chinese→