Yi Jiu Chinese Grammar: 一…就… for "As Soon As"

In yi jiu Chinese grammar, 一…就… (yī…jiù) means "as soon as": the second action happens right after the first one. The basic pattern is Subject + 一 + Action 1 + 就 + Action 2. For example, 我一到家就给你打电话 means "I'll call you as soon as I get home." The same pattern can also mean "whenever."

一…就… is an HSK 3 pattern and one of the most useful at that level. This article covers both meanings, where the subject goes, how to say 一, and how the pattern differs from 就 alone and from 刚…就…, with dialogues, mistakes and a quiz. For the full list of patterns at this level, see our HSK 3 grammar list.

Yi Jiu Chinese Grammar: The Quick Answer

The pattern has two parts:

一 (yī) marks the first action, the trigger.
就 (jiù) marks the second action, the result that follows straight away.

Subject + 一 + Verb 1，就 + Verb 2

我一到家就给你打电话。
- Pinyin: Wǒ yí dào jiā jiù gěi nǐ dǎ diànhuà.
- English: I'll call you as soon as I get home.

An easy way to remember it: 一 is the number "one." One step, and right away the next. The pattern has no tense of its own. The time comes from context, or from 了 at the end for past events.

How to Say "As Soon As" in Chinese

The most common use describes one moment: Action 1 happens, and Action 2 follows immediately.

Subject + 一 + Verb 1，就 + Verb 2

她一下班就去接孩子了。
- Pinyin: Tā yí xiàbān jiù qù jiē háizi le.
- English: She went to pick up the kids as soon as she finished work.
我一看菜单就知道这家店很贵。
- Pinyin: Wǒ yí kàn càidān jiù zhīdào zhè jiā diàn hěn guì.
- English: One look at the menu and I knew this place was expensive.

Only the 了 at the end of the first sentence tells you it already happened. Without it, 她一下班就去接孩子 would describe what she does every day. For more on that little word, see our guide to the particle 了.

"Once You Try, It Works": 一学就会

A common short form puts two single verbs together to say something is so easy that one try is enough.

这个菜很简单，你一学就会。
- Pinyin: Zhège cài hěn jiǎndān, nǐ yì xué jiù huì.
- English: This dish is really easy. You'll get it the first time you try.

You will also hear 一看就知道 ("you can tell at a glance") all the time.

Using 一…就… for "Whenever" in Chinese

The second use is about habits and reactions. Every time A happens, B happens too.

Subject + 一 + Verb / Adjective 1，就 + Verb 2

我一紧张就说不出话。
- Pinyin: Wǒ yì jǐnzhāng jiù shuō bu chū huà.
- English: Whenever I get nervous, I can't get a word out.
他一喝酒就脸红。
- Pinyin: Tā yì hē jiǔ jiù liǎn hóng.
- English: His face goes red whenever he drinks.

The first part can be a feeling, like 紧张 (nervous) or 累 (tired). Results like 说不出 are potential complements, covered in our guide to potential complements.

So is it "as soon as" or "whenever"? Sometimes the sentence alone doesn't say, and native speakers don't worry about it. 他一回家就玩手机 can describe one evening or every evening. 每次 (every time) or 总是 (always) makes the habit clear, and 了 usually points to one event.

Where Does the Subject Go in the 一…就… Sentence Pattern?

Both 一 and 就 are adverbs here, and Chinese adverbs sit after the subject and before the verb. That one rule explains this whole section.

Same Subject

When one person does both actions, say the subject once, at the start.

Subject + 一 + Verb 1 + 就 + Verb 2

他一回家就打开电脑。
- Pinyin: Tā yì huí jiā jiù dǎkāi diànnǎo.
- English: He turns on his computer as soon as he gets home.

You may also hear 一回家，他就打开电脑, with the subject in the second half. That is fine. What you cannot do is put the subject between 一 and the verb.

Different Subjects

With two different subjects, each one comes before its own adverb. So the second subject goes before 就.

Subject A + 一 + Verb 1，Subject B + 就 + Verb 2

老师一进教室，学生们就安静了。
- Pinyin: Lǎoshī yí jìn jiàoshì, xuéshengmen jiù ānjìng le.
- English: The moment the teacher walked into the classroom, the students went quiet.
我一说完，大家就笑了。
- Pinyin: Wǒ yì shuō wán, dàjiā jiù xiào le.
- English: As soon as I finished speaking, everyone laughed.

With one subject, the comma is optional. With two subjects, a comma is normal.

How to Pronounce 一 in 一…就…

一 is first tone (yī) on its own. Here it sits before a verb, so it follows the usual tone change rules:

Next syllable	一 is read as	Example
1st tone	yì	一听 (yì tīng), 一吃 (yì chī)
2nd tone	yì	一回家 (yì huí jiā), 一来 (yì lái)
3rd tone	yì	一想 (yì xiǎng), 一紧张 (yì jǐnzhāng)
4th tone	yí	一到 (yí dào), 一看 (yí kàn), 一下班 (yí xiàbān)

就 is always jiù. It is the same rule you already use for 一个 (yí ge) and 一起 (yìqǐ).

一…就… vs. 就 Alone

就 can link two actions without 一. On its own, it simply means "then" or "after that." Adding 一 makes the timing tighter and more urgent.

我下了班就去。
- Pinyin: Wǒ xià le bān jiù qù.
- English: I'll go after work.
我一下班就去。
- Pinyin: Wǒ yí xiàbān jiù qù.
- English: I'll go the minute I finish work.

Both are correct. The second one promises no delay at all.

就 alone has another job too. It can say something happened earlier than expected, as in 他七点就到了 (he was already there by seven). That is the opposite of 才, which our article on 就 vs. 才 explains.

一…就… vs. 刚…就…

刚…就… (gāng…jiù) looks similar but feels different. It means "had only just done A when B happened," and B is often a small surprise.

我刚到家，就下雨了。
- Pinyin: Wǒ gāng dào jiā, jiù xià yǔ le.
- English: I'd only just got home when it started raining.
我刚坐下，电话就响了。
- Pinyin: Wǒ gāng zuòxià, diànhuà jiù xiǎng le.
- English: I'd just sat down when the phone rang.

The main limit: 刚…就… is for one event that already happened, not for habits or plans. 我一紧张就说不出话 works, but "我刚紧张就说不出话" does not. For a single past event, native speakers sometimes use either pattern with little change in meaning. For more on 刚 itself, see our guide to 刚 vs. 刚才.

一…就… vs. 刚…就… vs. 就: Comparison Table

Pattern	Meaning	What it stresses	Example	English
一…就… (one event)	as soon as	B follows A with no delay	我一到家就给你打电话。	I'll call you as soon as I get home.
一…就… (habit)	whenever	A always brings B	他一喝酒就脸红。	His face goes red whenever he drinks.
刚…就…	had just… when	B came sooner than expected, past only	我刚坐下，电话就响了。	I'd just sat down when the phone rang.
就 (linking)	then, after that	simple order of events	我吃完饭就走。	I'll leave after I eat.

Yi Jiu Examples in Real Conversations

Dialogue 1: Picking Someone Up

A：你几点到上海？
- Pinyin: Nǐ jǐ diǎn dào Shànghǎi?
- English: What time do you get to Shanghai?
B：晚上八点左右。我一下飞机就给你发消息。
- Pinyin: Wǎnshang bā diǎn zuǒyòu. Wǒ yí xià fēijī jiù gěi nǐ fā xiāoxi.
- English: Around eight in the evening. I'll message you as soon as I get off the plane.
A：好。我在出口等你，你一出来就能看见我。
- Pinyin: Hǎo. Wǒ zài chūkǒu děng nǐ, nǐ yì chūlái jiù néng kànjiàn wǒ.
- English: OK. I'll wait at the exit. You'll see me the moment you come out.
B：太好了，谢谢！
- Pinyin: Tài hǎo le, xièxie!
- English: Great, thanks!

Dialogue 2: At a Restaurant

A：你怎么不吃了？
- Pinyin: Nǐ zěnme bù chī le?
- English: Why did you stop eating?
B：这个太辣了。我一吃辣的就肚子疼。
- Pinyin: Zhège tài là le. Wǒ yì chī là de jiù dùzi téng.
- English: This is too spicy. Whenever I eat spicy food, I get a stomachache.
A：那你早点儿说啊！我们再点一个不辣的吧。
- Pinyin: Nà nǐ zǎo diǎnr shuō a! Wǒmen zài diǎn yí ge bú là de ba.
- English: You should have said so earlier! Let's order something that isn't spicy.
B：好，服务员一来我就点。
- Pinyin: Hǎo, fúwùyuán yì lái wǒ jiù diǎn.
- English: OK, I'll order as soon as the waiter comes over.

Common Mistakes with 一…就…

Mistake 1: Putting 就 Before the Second Subject

Wrong: 我一说完，就大家笑了。
Right: 我一说完，大家就笑了。
- Pinyin: Wǒ yì shuō wán, dàjiā jiù xiào le.
- English: As soon as I finished speaking, everyone laughed.

Mistake 2: Putting the Subject After 一

Wrong: 一我到家就给你打电话。
Right: 我一到家就给你打电话。
- Pinyin: Wǒ yí dào jiā jiù gěi nǐ dǎ diànhuà.
- English: I'll call you as soon as I get home.

Mistake 3: Leaving Out 就

English has no word for 就 here, so learners often drop it.

Wrong: 我一到家给你打电话。
Right: 我一到家就给你打电话。
- Pinyin: Wǒ yí dào jiā jiù gěi nǐ dǎ diànhuà.
- English: I'll call you as soon as I get home.

Mistake 4: Using 一…就… for "As Soon As Possible"

"As soon as possible" has its own word.

Wrong: 请你一可能就回复我。
Right: 请你尽快回复我。
- Pinyin: Qǐng nǐ jǐnkuài huífù wǒ.
- English: Please reply to me as soon as possible.

Practice Quiz: 一…就…

Answers are below.

Put the words in order: 他 / 就 / 一 / 下课 / 去打球 (He goes to play ball as soon as class ends.)
Fill in the blanks: 我 ___ 累 ___ 想吃甜的。 (Whenever I'm tired, I want something sweet.)
Fix the sentence: 妈妈一做好饭，就我们坐下来吃。
一 or 刚? 我 ___ 喝咖啡就睡不着。 (Whenever I drink coffee, I can't sleep.)

Answers

他一下课就去打球。 (Tā yí xiàkè jiù qù dǎ qiú.)
一, 就: 我一累就想吃甜的。 (Wǒ yí lèi jiù xiǎng chī tián de.)
妈妈一做好饭，我们就坐下来吃。 (The second subject goes before 就.)
一: 我一喝咖啡就睡不着。 It is a habit, and 刚 cannot describe habits.

Frequently Asked Questions

What does 一…就… mean in Chinese?

一…就… (yī…jiù) means "as soon as" or "the moment." It links two actions and says the second one follows the first right away, as in 我一到家就给你打电话 (I'll call you as soon as I get home).

Can 一…就… mean "whenever"?

Yes. When the two actions always go together, 一…就… describes a habit or a reaction, as in 我一紧张就说不出话 (whenever I get nervous, I can't get a word out). Context tells you if it is one event or a habit.

Where does the subject go in a 一…就… sentence?

The subject goes before 一 and before 就, never after them. With one subject you say 我一下班就回家. With two subjects, each one comes before its own adverb: 老师一进来，学生们就安静了.

What is the difference between 一…就… and 刚…就…?

刚…就… means "had just done A when B happened" and is used for one past event, often a surprise. 一…就… is wider. It works for the past, the future and habits.

How do you pronounce 一 in 一…就…?

一 follows its normal tone changes. It is yí before a fourth tone, as in 一看 (yí kàn), and yì before first, second and third tones, as in 一听 (yì tīng). 就 is always jiù.

What's Next

Once 一…就… feels natural, make a few sentences about your own day: what you do as soon as you wake up, get to work or get home.

Learn Chinese is free to download on iOS and Android, with HSK vocabulary, built-in audio, grammar lessons and practice tests to help you use 一…就… with confidence. HSK 1 and 2 are free in full, and Learn Chinese Pro adds HSK 3 to 6.