B2 Conjunctions & Connectors 13 min read Easy

As Soon As... Then... (一...就...)

Use 一...就... to connect two events where the second happens instantly after the first.
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Grammar Rule in 30 Seconds

Use '一...就...' to describe two actions happening in immediate succession, where the second action follows the first instantly.

  • Place '一' before the first action: {一|yī} {下班|xiàbān}...
  • Place '就' before the second action: ...{就|jiù} {回家|huíjiā}.
  • The subject usually goes before '一', but can go after: {我|wǒ} {一|yī} {到|dào} {就|jiù} {吃|chī}.
Subject + 一 + Verb 1 + 就 + Verb 2

Overview

The structure 一...就... (yī...jiù...) is one of the most fundamental and high-frequency patterns in Mandarin Chinese for connecting two events. At its core, it expresses an immediate and often consequential relationship between two actions. The basic translation is "as soon as...

then...", but its function is more profound. It signifies that the second event is a direct, swift, and often inevitable result of the first. There is no perceived time lag between the two clauses.

Mastering this pattern is essential for moving beyond stilted, separate sentences and into the fluid, interconnected expression typical of native speech. It's the grammatical glue for cause and effect, habitual reactions, and rapid sequences of events.

For a B2 learner, refining your use of 一...就... involves understanding its nuances beyond the basic definition. It’s not just about two things happening quickly; it’s about a trigger (一 + Action 1) and a reflexive response (就 + Action 2). Whether describing how you instantly reach for coffee upon waking (我一醒就想喝咖啡 - wǒ yī xǐng jiù xiǎng hē kāfēi) or how a project immediately stalls when a key person is absent, this structure conveys a tight, logical bond between the two parts of the sentence.

It is the linguistic embodiment of a trigger-response mechanism.

How This Grammar Works

To understand 一...就... properly, we must analyze its two components. The character 一 (yī) does not simply mean "one" in this context. Here, it functions as a temporal adverb, pinpointing the exact moment an action is completed.
Think of it as establishing a temporal boundary: the very instant Action 1 concludes, the condition is met for Action 2 to begin. It sets the stage by saying, "Upon the completion of this first event..."
就 (jiù) is the logical counterpart. While it can mean "then" or "just," its role here is to emphasize immediacy and consequence. It signals that the second action isn't just a random event that followed the first; it is a direct, logical, and prompt result.
就 is what gives the pattern its punch, indicating that there is no delay or hesitation. For example, in the sentence 他一听就明白了 (tā yī tīng jiù míngbái le), the understanding (明白) isn't a slow process of consideration; it's an instantaneous flash of insight (一听) triggered by the act of hearing. The pattern fuses the two events into a single, fluid cause-and-effect sequence.
The underlying principle is one of tight sequentiality and logical dependency. Chinese grammar often relies on word order and function words to show relationships that in English might require more complex clauses. 一...就... is a highly efficient tool for this.
It implies that the occurrence of Action 1 is a sufficient condition to guarantee the immediate occurrence of Action 2. This is why it works so well for habits, unbreakable laws of nature, or personal idiosyncrasies. For example, 天一冷，我的鼻子就过敏 (tiān yī lěng, wǒ de bízi jiù guòmǐn) presents the cold weather and the allergic reaction not as two separate facts, but as an inseparable pair.
It is also worth noting the phonological change of 一 (yī), known as tone sandhi. Its tone changes based on the syllable that follows it. While this becomes automatic with practice, being aware of the rule is helpful:
  • Before a 1st, 2nd, or 3rd tone syllable, 一 (yī) is pronounced with a 4th tone: yì. (e.g., 一天 - yì tiān)
  • Before a 4th tone syllable, 一 (yī) is pronounced with a 2nd tone: yí. (e.g., 一下 - yí xià)

Formation Pattern

1
The structure of 一...就... is straightforward but has a critical rule regarding the subject of the second clause. Pay close attention to the placement of the subject.
2
1. When the Subject is the Same for Both Actions
3
This is the most common formation. The subject is stated only once at the beginning of the sentence.
4
Formula: Subject + 一 + Verb Phrase 1 + 就 + Verb Phrase 2
5
我一下班就回家。
6
(wǒ yī xiàbān jiù huíjiā.)
7
As soon as I get off work, I go home.
8
他一喝酒就脸红。
9
(tā yī hējiǔ jiù liǎnhóng.)
10
He blushes as soon as he drinks alcohol.
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2. When the Subjects of the Two Actions are Different
12
This is a crucial point of grammar. The subject of the second clause must be placed immediately before 就. Placing it after 就 is a common and significant error.
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Formula: Subject 1 + 一 + Verb Phrase 1, Subject 2 + 就 + Verb Phrase 2
14
老师一进教室，我们就安静了。
15
(lǎoshī yī jìn jiàoshì, wǒmen jiù ānjìng le.)
16
As soon as the teacher entered the classroom, we became quiet.
17
闹钟一响，我就醒了。
18
(nàozhōng yī xiǎng, wǒ jiù xǐng le.)
19
As soon as the alarm rings, I wake up.
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Below is a summary table of the formation patterns:
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| Pattern Type | Structure | Example | Translation |
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| :--- | :--- | :--- | :--- |
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| Same Subject | Subj + 一 + VP1 + 就 + VP2 | 她一累就想睡觉。 (tā yī lèi jiù xiǎng shuìjiào) | As soon as she gets tired, she wants to sleep. |
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| Different Subjects | Subj 1 + 一 + VP1, Subj 2 + 就 + VP2 | 信号灯一变绿，司机就开车了。 (xìnhàodēng yī biàn lǜ, sījī jiù kāichē le) | As soon as the traffic light turned green, the driver drove off. |

When To Use It

This pattern's versatility is one of its strengths. It can be used to describe a variety of immediate relationships between events. Understanding these categories will help you use it more accurately.
1. Direct Cause and Effect
This is the most intuitive use, where Action 1 directly and invariably causes Action 2. The relationship is almost scientific in its predictability. This is often used for physical reactions, emotional responses, or mechanical operations.
  • 我一吃花生就过敏。 (wǒ yī chī huāshēng jiù guòmǐn.) - As soon as I eat peanuts, I have an allergic reaction.
  • 这个婴儿一笑，大家的心就化了。 (zhège yīng'ér yī xiào, dàjiā de xīn jiù huà le.) - As soon as this baby smiles, everyone's hearts melt.
  • 电脑一中病毒，运行速度就变慢了。 (diànnǎo yī zhòng bìngdú, yùnxíng sùdù jiù biàn màn le.) - As soon as the computer gets a virus, its operating speed slows down.
2. Habitual or Recurring Actions (Whenever...)
When the sentence describes a general truth or a habit, 一...就... is equivalent to "whenever." It implies that every single time the first condition is met, the second action follows without fail. This is extremely common in describing routines, personalities, or predictable scenarios.
  • 我父亲一有空就去钓鱼。 (wǒ fùqīn yī yǒu kòng jiù qù diàoyú.) - Whenever my father has free time, he goes fishing.
  • 他一遇到难题就想放弃。 (tā yī yù dào nántí jiù xiǎng fàngqì.) - Whenever he encounters a difficult problem, he wants to give up.
  • 老板一不在，同事们就开始聊天。 (lǎobǎn yī bùzài, tóngshìmen jiù kāishǐ liáotiān.) - Whenever the boss isn't around, the colleagues start chatting.
3. Immediate Temporal Succession
In this use, the first action doesn't strictly cause the second, but it serves as the immediate temporal trigger for it. The focus is on the back-to-back nature of the events rather than a logical cause. This is common for giving instructions or narrating a sequence of events.
  • 你下飞机就给我发个信息。 (nǐ xià fēijī jiù gěi wǒ fā gè xìnxī.) - As soon as you get off the plane, send me a message.
  • 我一毕业就出国留学了。 (wǒ yī bìyè jiù chūguó liúxué le.) - I went to study abroad as soon as I graduated.
  • 看完电影我们就回家吧。 (kàn wán diànyǐng wǒmen jiù huí jiā ba.) - Let's go home right after we finish the movie. (Note the use of the result complement 完 (wán) to emphasize completion).
4. A Sudden Discovery or Realization
The first action leads to a sudden realization or discovery expressed in the second clause. The 就 highlights the 'aha!' moment.
  • 我一尝这道菜，就知道是你做的。 (wǒ yī cháng zhè dào cài, jiù zhīdào shì nǐ zuò de.) - As soon as I tasted this dish, I knew it was you who made it.
  • 他一看到我的表情，就明白了我的意思。 (tā yī kàn dào wǒ de biǎoqíng, jiù míngbái le wǒ de yìsi.) - The moment he saw my expression, he understood what I meant.

Common Mistakes

As a B2 learner, avoiding common errors with this structure is key to sounding more natural. Here are the most frequent pitfalls and how to correct them.
1. Incorrect Placement of the Second Subject
This is the most critical grammatical error. The subject of the second clause always comes before 就.
  • Incorrect: 老板一开会，就我们都很紧张。 (lǎobǎn yī kāihuì, jiù wǒmen dōu hěn jǐnzhāng.)
  • Correct: 老板一开会，我们就都很紧张。 (lǎobǎn yī kāihuì, wǒmen jiù dōu hěn jǐnzhāng.)
  • Reason: 就 is an adverb that modifies the verb phrase that follows it. The subject (我们) must be established before the adverbial phrase (就都很紧张) that describes its action.
2. Redundancy with other Temporal Words
The 一 in this pattern already functions to mean "the moment that." Adding another word like 的时候 (de shíhou - when) is redundant and grammatically incorrect.
  • Incorrect: 我一回家的时候，就感觉很累。 (wǒ yī huí jiā de shíhou, jiù gǎnjué hěn lèi.)
  • Correct: 我一回家就感觉很累。 (wǒ yī huí jiā jiù gǎnjué hěn lèi.)
  • Reason: It's like saying "As soon as when I get home..." in English. The temporal marker is stated twice, which is unnatural.
3. Confusing 一...就... with Hypotheticals (如果...就...)
一...就... is for factual sequences (past or present habits) or highly certain future events. It is not for general, uncertain hypotheticals. For that, you should use 如果...就... (rúguǒ...jiù...).
  • Context: Discussing a plan with an uncertain condition.
  • Incorrect: 明天一晴天，我们就去公园。 (This implies you are certain it will be sunny.)
  • Correct: 如果明天晴天，我们就去公园。 (rúguǒ míngtiān qíngtiān, wǒmen jiù qù gōngyuán.) (This is the correct way to state a hypothetical plan.)
  • Nuance: You can use 一...就... for the future, but it signals a firm plan or expectation: 等会儿雨一停，我们就出发 (Děng huìr yǔ yī tíng, wǒmen jiù chūfā) - "The moment the rain stops, we will set off." This shows more certainty than 如果.
4. Misuse of the Aspect Particle 了 (le)
Learners often struggle with where to place 了 or whether to use it at all. For 一...就..., 了 is typically used to indicate the completion of the entire sequence in the past. It usually appears at the very end of the sentence or after the verb in the second clause. It is generally not used after the verb in the first clause.
  • Incorrect: 我一吃了饭就出门了。 (wǒ yī chī le fàn jiù chūmén le.)
  • Correct (for completed action): 我一吃完饭就出门了。 (wǒ yī chī wán fàn jiù chūmén le.) Using a result complement like 完 (wán) is more natural here.
  • Correct (for past event): 他一来，我们便走了。 (tā yī lái, wǒmen biàn zǒu le.) Note: 便 (biàn) is a more formal synonym for 就.
  • Correct (for habitual action, no 了): 他以前一生病就不去上课。 (tā yǐqián yī shēngbìng jiù bù qù shàngkè.)

Real Conversations

This pattern is ubiquitous in daily life. Here are a few examples of how it appears in modern, natural contexts.

S

Scenario 1

Making plans via a messaging app

- Li Na: 你到哪儿了？会议马上就要开始了。

(Nǐ dào nǎr le? Huìyì mǎshàng jiùyào kāishǐ le.)

(Where are you? The meeting is about to start.)

- Zhang Wei: 在路上了！我一下车就跑上去，大概五分钟。

(Zài lùshàng le! Wǒ yī xiàchē jiù pǎo shàngqù, dàgài wǔ fēnzhōng.)

(On my way! I'll run up as soon as I get out of the car, maybe five minutes.)

S

Scenario 2

Colleagues discussing a new policy at work

- A: 你听说了吗？公司的新报销政策。

(Nǐ tīng shuō le ma? Gōngsī de xīn bàoxiāo zhèngcè.)

(Have you heard? The company's new reimbursement policy.)

- B: 听说了，太复杂了。我一看那个流程图就头疼。

(Tīng shuō le, tài fùzá le. Wǒ yī kàn nàge liúchéngtú jiù tóuténg.)

(I heard, it's so complicated. I get a headache as soon as I look at that flowchart.)

S

Scenario 3

A social media post (e.g., on Weibo or WeChat Moments)

#城市生活# 真是奇怪，我一决定周末宅家，天气就好得不得了。我一计划出门，天就开始下雨。这算不算是墨菲定律？

(#chéngshì shēnghuó# Zhēnshi qíguài, wǒ yī juédìng zhōumò zhái jiā, tiānqì jiù hǎo dé bùdéliǎo. Wǒ yī jìhuà chūmén, tiān jiù kāishǐ xiàyǔ. Zhè suàn bù suànshì mòfēi dìnglǜ?)

(#CityLife# It's so strange, as soon as I decide to stay home for the weekend, the weather becomes amazing. As soon as I plan to go out, it starts to rain. Does this count as Murphy's Law?)

Quick FAQ

Q: What is the difference between 一...就... and 刚...就... (gāng...jiù...)?

This is a common point of confusion. 刚 (gāng) means "just now" and emphasizes the recency of the first action. 一...就... emphasizes the immediate sequence and causal link.

| Feature | 一...就... (yī...jiù...) | 刚...就... (gāng...jiù...) |
| :--- | :--- | :--- |
| Main Focus | Immediate sequence, cause-and-effect, no time lag. | The recency of Action 1. It just happened. |
| Relationship | Often causal or habitual. Action 1 triggers Action 2. | Purely temporal. Action 2 happened shortly after Action 1. |
| Example | 我一到家就下雨了。 (As soon as I arrived, it rained - implies immediacy). | 我刚到家就下雨了。 (I had just gotten home when it rained - emphasizes my recent arrival). |
| Habitual Use| Yes (他一喝酒就话多。 - He always gets talkative when he drinks.) | No. 刚 refers to a specific, recent past event. |
Q: Can I place adverbs between 就 and the second verb?

Yes, it is possible to place certain adverbs, especially those that reinforce immediacy, between 就 and the verb. This can add emphasis.

  • 他一听到这个消息，就立刻站了起来。 (tā yī tīng dào zhège xiāoxī, jiù lìkè zhàn le qǐlái.) - As soon as he heard the news, he immediately stood up.
  • 雨一停，我们就可以马上出发。 (yǔ yī tíng, wǒmen jiù kěyǐ mǎshàng chūfā.) - As soon as the rain stops, we can set off right away.
Q: Can the 一 be omitted in speech?

In very fast, informal spoken Mandarin, native speakers sometimes omit the 一 if the context makes the relationship clear. The 就 is almost never dropped as it carries the core meaning of the consequence. For example, you might hear (一)听就知道是假的 ([yī] tīng jiù zhīdào shì jiǎ de). However, as a learner, you should always include 一 to ensure your speech is grammatically correct and clear. Omitting it is a native-speaker shortcut that should only be adopted after complete mastery.

Q: Is there a negative form of 一...就...?

Yes, you can negate the verb in either clause. Negating the second clause is very common and is used to express a negative consequence or habit.

  • 我一喝咖啡就睡不着觉。 (wǒ yī hē kāfēi jiù shuì bùzháo jué.) - As soon as I drink coffee, I can't fall asleep.
  • 他一忙起来就不吃饭。 (tā yī máng qǐlái jiù bù chīfàn.) - Whenever he gets busy, he doesn't eat.
Negating the first clause is less common but possible, creating a "the moment X doesn't happen..." scenario: 他一天不学习，就觉得不舒服 (tā yī tiān bù xuéxí, jiù juédé bú shūfú) - "If he goes a day without studying, he feels uncomfortable."

Basic Structure Table

Subject Marker 1 Action 1 Marker 2 Action 2
我
一
到家
就
休息
他
一
下课
就
回家
老师
一
进来
就
上课
天
一
黑
就
冷
你
一
说
就
懂
我们
一
见面
就
聊天

Meanings

This structure indicates that the second event occurs immediately following the first, often implying a cause-and-effect relationship or a habitual sequence.

1

Immediate Sequence

Event B happens right after Event A.

“{他|tā} {一|yī} {来|lái} {就|jiù} {问|wèn} {我|wǒ}.”

“{我|wǒ} {一|yī} {听|tīng} {到|dào} {这|zhè} {个|gè} {消|xiāo} {息|xi|jiù} {就|jiù} {很|hěn} {开|kāi} {心|xīn}.”

Reference Table

Reference table for As Soon As... Then... (一...就...)
Form Structure Example
Affirmative
Subj + 一 + V1 + 就 + V2
我一到就吃
Negative (V2)
Subj + 一 + V1 + 就 + 不/没 + V2
我一吃就不饿
Different Subjects
Subj1 + 一 + V1 + 就 + Subj2 + V2
他一走我就哭
Habitual
Subj + 一 + V1 + 就 + V2
我一累就睡
Past Event
Subj + 一 + V1 + 就 + V2
他一到就说了
Conditional
Subj + 一 + V1 + 就 + V2
一有空我就去

Formality Spectrum

Formal
我一到达便会与您联系。

我一到达便会与您联系。 (Professional vs. Casual)

Neutral
我一到就给你打电话。

我一到就给你打电话。 (Professional vs. Casual)

Informal
我一到就打给你。

我一到就打给你。 (Professional vs. Casual)

Slang
我一到就call你。

我一到就call你。 (Professional vs. Casual)

The Sequence Flow

一...就...

Trigger

  • 一 As soon as

Result

  • 就 Then/Immediately
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Examples by Level

1

{我|wǒ} {一|yī} {回|huí} {家|jiā} {就|jiù} {睡|shuì} {觉|jiào}.

I sleep as soon as I get home.

2

{他|tā} {一|yī} {看|kàn} {书|shū} {就|jiù} {困|kùn}.

He gets sleepy as soon as he reads.

3

{天|tiān} {一|yī} {亮|liàng} {他|tā} {就|jiù} {走|zǒu} {了|le}.

He left as soon as it got bright.

4

{我|wǒ} {一|yī} {听|tīng} {就|jiù} {懂|dǒng}.

I understand as soon as I hear it.

1

{我|wǒ} {一|yī} {下|xià} {班|bān} {就|jiù} {去|qù} {健|jiàn} {身|shēn}.

I go to the gym as soon as I finish work.

2

{妈|mā} {妈|ma} {一|yī} {叫|jiào} {我|wǒ} {我|wǒ} {就|jiù} {醒|xǐng}.

I wake up as soon as Mom calls me.

3

{这|zhè} {个|gè} {电|diàn} {影|yǐng} {我|wǒ} {一|yī} {看|kàn} {就|jiù} {哭|kū}.

I cry as soon as I watch this movie.

4

{他|tā} {一|yī} {到|dào} {公|gōng} {司|sī} {就|jiù} {开|kāi} {会|huì}.

He starts a meeting as soon as he arrives at the office.

1

{我|wǒ} {一|yī} {看|kàn} {到|dào} {他|tā} {就|jiù} {想|xiǎng} {起|qǐ} {了|le} {那|nà} {件|jiàn} {事|shì}.

I think of that matter as soon as I see him.

2

{这|zhè} {里|lǐ} {一|yī} {到|dào} {夏|xià} {天|tiān} {就|jiù} {很|hěn} {热|rè}.

It gets very hot here as soon as summer arrives.

3

{他|tā} {一|yī} {有|yǒu} {钱|qián} {就|jiù} {乱|luàn} {花|huā}.

He spends money recklessly as soon as he has it.

4

{我|wǒ} {一|yī} {解|jiě} {释|shì} {他|tā} {就|jiù} {明|míng} {白|bai} {了|le}.

He understood as soon as I explained.

1

{项|xiàng} {目|mù} {一|yī} {启|qǐ} {动|dòng} {我|wǒ} {们|men} {就|jiù} {得|děi} {加|jiā} {班|bān}.

We have to work overtime as soon as the project starts.

2

{他|tā} {一|yī} {听|tīng} {到|dào} {这|zhè} {个|gè} {消|xiāo} {息|xi|jiù} {就|jiù} {立|lì} {刻|kè} {赶|gǎn} {了|le} {过|guò} {来|lái}.

He rushed over immediately as soon as he heard the news.

3

{我|wǒ} {一|yī} {看|kàn} {到|dào} {这|zhè} {种|zhǒng} {情|qíng} {况|kuàng} {就|jiù} {感|gǎn} {到|dào} {很|hěn} {担|dān} {心|xīn}.

I feel worried as soon as I see this situation.

4

{这|zhè} {款|kuǎn} {手|shǒu} {机|jī} {一|yī} {上|shàng} {市|shì} {就|jiù} {被|bèi} {抢|qiǎng} {购|gòu} {一|yī} {空|kōng}.

This phone was sold out as soon as it hit the market.

1

{他|tā} {一|yī} {旦|dàn} {下|xià} {定|dìng} {决|jué} {心|xīn} {就|jiù} {绝|jué} {不|bù} {回|huí} {头|tóu}.

Once he makes up his mind, he never looks back.

2

{这|zhè} {种|zhǒng} {药|yào} {一|yī} {服|fú} {下|xià} {去|qù} {就|jiù} {会|huì} {产|chǎn} {生|shēng} {副|fù} {作|zuò} {用|yòng}.

Side effects occur as soon as this medicine is taken.

3

{他|tā} {一|yī} {向|xiàng} {都|dōu} {是|shì} {一|yī} {说|shuō} {话|huà} {就|jiù} {脸|liǎn} {红|hóng}.

He has always been the type to blush as soon as he speaks.

4

{这|zhè} {个|gè} {政|zhèng} {策|cè} {一|yī} {实|shí} {施|shī} {就|jiù} {引|yǐn} {起|qǐ} {了|le} {广|guǎng} {泛|fàn} {关|guān} {注|zhù}.

The policy drew widespread attention as soon as it was implemented.

1

{他|tā} {一|yī} {生|shēng} {气|qì} {就|jiù} {不|bù} {理|lǐ} {人|rén}，{这|zhè} {种|zhǒng} {性|xìng} {格|gé} {真|zhēn} {是|shì} {让|ràng} {人|rén} {无|wú} {奈|nài}.

He ignores people as soon as he gets angry; this personality is truly frustrating.

2

{这|zhè} {个|gè} {问|wèn} {题|tí} {一|yī} {提|tí} {出|chū} {来|lái} {就|jiù} {引|yǐn} {发|fā} {了|le} {激|jī} {烈|liè} {的|de} {争|zhēng} {论|lùn}.

The question sparked intense debate as soon as it was raised.

3

{我|wǒ} {一|yī} {想|xiǎng} {起|qǐ} {当|dāng} {年|nián} {的|de} {往|wǎng} {事|shì} {就|jiù} {不|bù} {禁|jīn} {感|gǎn} {慨|kǎi} {万|wàn} {千|qiān}.

I cannot help but feel deeply moved as soon as I think of the past.

4

{他|tā} {一|yī} {到|dào} {了|le} {那|nà} {个|gè} {年|nián} {纪|jì} {就|jiù} {变|biàn} {得|de} {格|gé} {外|wài} {沉|chén} {稳|wěn}.

He became exceptionally steady as soon as he reached that age.

Easily Confused

As Soon As... Then... (一...就...) vs 一...就... vs 刚...就...

Both describe sequence, but '刚' emphasizes recency.

As Soon As... Then... (一...就...) vs 一...就... vs 才...就...

Both involve timing, but '才' implies 'only just' or 'not until'.

As Soon As... Then... (一...就...) vs 一...就... vs 一旦...就...

Both mean 'as soon as', but '一旦' is much more formal.

Common Mistakes

✗

一我到家就睡觉

✓

我一到家就睡觉

Subject must come before '一'.
✗

我到家就睡觉

✓

我一到家就睡觉

Missing the '一' marker.
✗

我一到家睡觉

✓

我一到家就睡觉

Missing the '就' marker.
✗

一到家我就睡觉

✓

我一到家就睡觉

Subject placement is flexible, but '我一到家就睡觉' is more standard.
✗

他一去就买东西了

✓

他一去就买了东西

Aspect marker placement.
✗

我一想就想到了

✓

我一想就想到了

Actually correct, but often misused in context.
✗

一他来我就走

✓

他一来我就走

Subject placement.
✗

我一昨天到家就睡觉

✓

我昨天一到家就睡觉

Time words should come before the '一...就...' structure.
✗

我一到家就想睡觉了

✓

我一到家就想睡觉

Redundant '了' in habitual sentences.
✗

一有时间我就去

✓

我一有时间就去

Subject missing.
✗

一旦他一到家就睡觉

✓

他一到家就睡觉

Combining '一旦' and '一...就...' is redundant.
✗

他一到家就睡觉了

✓

他一到家就睡觉

In habitual contexts, '了' is often omitted.
✗

我一到家就睡觉的

✓

我一到家就睡觉

Unnecessary '的'.

Sentence Patterns

我一___就___。

___一___就___。

一___，我就___。

___一___，___就___。

Real World Usage

Texting constant

我一到就发信息给你。

Social Media very common

我一看到这照片就笑了。

Job Interviews common

我一毕业就加入了这家公司。

Travel common

我一到机场就找出租车。

Food Delivery Apps occasional

我一收到外卖就吃。

Academic Writing common

该现象一出现就引起了关注。

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💡

Subject Placement

If the subject is the same, put it at the very beginning. If different, put the first subject before '一' and the second before '就'.
⚠️

Don't over-use '了'

In habitual sentences, '了' is often unnecessary. Only use it for specific past events.
🎯

Rhythm

Use this structure to balance your sentences. It makes your speech sound more rhythmic and professional.
💬

Politeness

In formal settings, consider using '便' instead of '就' for a more elegant tone.

Smart Tips

Use '一...就...' to group your actions into logical pairs.

我下班。我回家。我吃饭。 → 我一下班就回家，一到家就吃饭。

Use this structure to show that the second action is a direct result of the first.

我看到他。我生气。 → 我一看到他就生气。

Swap '就' for '便' to instantly elevate your register.

该政策一实施就引起了关注。 → 该政策一实施便引起了关注。

Place the second subject right after '就' to keep the sentence clear.

一到家，我妈妈就做饭。 → 我一到家，妈妈就做饭。

Pronunciation

yī dào (1st+4th), yì tiān (4th+1st)

Tone of '一'

When '一' is followed by a 4th tone, it becomes 2nd tone. When followed by other tones, it becomes 4th tone.

Rising-Falling

一... (rise) 就... (fall)

Emphasizes the immediacy of the action.

Memorize It

Mnemonic

Think of '一' as the starting gun and '就' as the runner taking off immediately.

Visual Association

Imagine a light switch. '一' is your finger touching the switch, and '就' is the light turning on instantly.

Rhyme

一 comes first, the action starts, 就 follows fast, with all its hearts.

Story

Xiao Ming is very hungry. He walks through the door (一). The moment he enters, he sees pizza (就). He eats it immediately.

Word Web

一就立刻马上动作时间顺序

Challenge

Write 5 sentences about your morning routine using '一...就...' and say them out loud.

Cultural Notes

Used extensively in daily life to describe routines and habits.

Similar usage, but sometimes '就' is replaced by '便' in more formal writing.

The structure is used, but often influenced by Cantonese grammar which might omit the '一'.

The '一...就...' structure evolved from classical Chinese where '一' (one) denoted the beginning of an action.

Conversation Starters

“

你一到家通常做什么？

“

你一看到什么就会觉得开心？

“

如果你的朋友一迟到就道歉，你会原谅他吗？

“

你认为一个人一成功就变得傲慢是正常的吗？

Journal Prompts

Describe your morning routine.
Write about a time you were very excited.
Discuss the impact of technology on communication.
Reflect on a life-changing decision.

Common Mistakes

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

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Test Yourself

Fill in the blanks with 一 or 就.

我___到家___休息。

✓ Correct! ✗ Not quite. Correct answer: a
The structure is 一...就...
Choose the correct sentence. Multiple Choice

Which is correct?

✓ Correct! ✗ Not quite. Correct answer: a
Subject must precede '一'.
Find the error. Error Correction

Find and fix the mistake:

我一到家睡觉。

✓ Correct! ✗ Not quite. Correct answer: a
Needs '就' to complete the structure.
Reorder the words. Sentence Reorder

Arrange the words in the correct order:

All words placed

Click words above to build the sentence

✓ Correct! ✗ Not quite. Correct answer: a
Standard word order.
Translate to Chinese. Translation

I eat as soon as I am hungry.

Answer starts with: a...

✓ Correct! ✗ Not quite. Correct answer: a
Correct structure.
Complete the dialogue. Dialogue Completion

A: 你什么时候去？ B: ___

✓ Correct! ✗ Not quite. Correct answer: a
Logical response.
Build a sentence. Sentence Building

Use: 他, 看到, 我, 笑.

✓ Correct! ✗ Not quite. Correct answer: a
Correct structure.
Sort the sentences. Grammar Sorting

Which sentence is most formal?

✓ Correct! ✗ Not quite. Correct answer: a
'便' is more formal than '就'.

Score: /8

Practice Exercises

8 exercises
Fill in the blanks with 一 or 就.

我___到家___休息。

✓ Correct! ✗ Not quite. Correct answer: a
The structure is 一...就...
Choose the correct sentence. Multiple Choice

Which is correct?

✓ Correct! ✗ Not quite. Correct answer: a
Subject must precede '一'.
Find the error. Error Correction

Find and fix the mistake:

我一到家睡觉。

✓ Correct! ✗ Not quite. Correct answer: a
Needs '就' to complete the structure.
Reorder the words. Sentence Reorder

就 / 我 / 一 / 到家 / 休息

✓ Correct! ✗ Not quite. Correct answer: a
Standard word order.
Translate to Chinese. Translation

I eat as soon as I am hungry.

✓ Correct! ✗ Not quite. Correct answer: a
Correct structure.
Complete the dialogue. Dialogue Completion

A: 你什么时候去？ B: ___

✓ Correct! ✗ Not quite. Correct answer: a
Logical response.
Build a sentence. Sentence Building

Use: 他, 看到, 我, 笑.

✓ Correct! ✗ Not quite. Correct answer: a
Correct structure.
Sort the sentences. Grammar Sorting

Which sentence is most formal?

✓ Correct! ✗ Not quite. Correct answer: a
'便' is more formal than '就'.

Score: /8

Practice Bank

12 exercises
Put the words in the correct order. Sentence Reorder

As soon as it rains, I don't want to go out.

✓ Correct! ✗ Not quite. Correct answer: 天一下雨我就不想出门
Translate into Chinese. Translation

As soon as he wakes up, he looks at his phone.

✓ Correct! ✗ Not quite. Correct answer: 他一醒就看手机。
Find the wrong character placement. Error Correction

外卖到一，我们就吃饭。 (As soon as the delivery arrives, we eat.)

✓ Correct! ✗ Not quite. Correct answer: 外卖一到，我们就吃饭。
Match the triggers with their logical instant results. Match Pairs

Match the first half to the second half.

✓ Correct! ✗ Not quite. Correct answer: 我一下班... -> ...就去健身房。, 老板一来... -> ...大家就假装工作。, 天一黑... -> ...我就想睡觉。
Fill in the correct result marker. Fill in the Blank

你一看到红绿灯 ___ 左转。 (As soon as you see the traffic light, turn left.)

✓ Correct! ✗ Not quite. Correct answer: 就
Which translation is correct? Multiple Choice

Whenever I eat spicy food, I sweat.

✓ Correct! ✗ Not quite. Correct answer: 我一吃辣就出汗。
Reorder the sentence correctly. Sentence Reorder

As soon as Mom comes back, the dog is happy.

✓ Correct! ✗ Not quite. Correct answer: 妈妈一回家狗就开心
Translate into Chinese. Translation

Once the movie starts, stop talking.

✓ Correct! ✗ Not quite. Correct answer: 电影一开始就别说话。
Fix the mistake. Error Correction

我一听到这首歌想哭就。 (Whenever I hear this song, I want to cry.)

✓ Correct! ✗ Not quite. Correct answer: 我一听到这首歌就想哭。
Fill in the blank. Fill in the Blank

他 ___ 紧张就结巴。 (Whenever he gets nervous, he stutters.)

✓ Correct! ✗ Not quite. Correct answer: 一
Match the grammar piece to its function. Match Pairs

What does each word do?

✓ Correct! ✗ Not quite. Correct answer: 一 (yī) -> Marks the trigger action, 就 (jiù) -> Marks the instant result, Subject 2 -> Goes BEFORE 就 if it's a new person
Which sentence correctly uses past tense? Multiple Choice

As soon as he arrived, he slept.

✓ Correct! ✗ Not quite. Correct answer: 他一到就睡觉了。

Score: /12

FAQ (8)

Yes, it is very common for future plans, e.g., '我一到就给你打电话'.

Usually yes, but it can be omitted if the context is clear.

No, it works for specific past, present, and future events.

Yes, e.g., '我一看到他就不想说话'.

'一旦' is for formal, conditional situations; '一' is for general use.

Yes, e.g., '老师一进来，学生就安静了'.

Yes, but only for specific completed actions, not general habits.

Because '一' and '就' work together to link two clauses.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

Sign up free to practice

In Other Languages

Spanish high

Tan pronto como

Spanish requires verb conjugation based on the subject.

French high

Dès que

French requires tense agreement.

German high

Sobald

German word order changes after 'sobald'.

Japanese high

～とすぐに

Japanese is SOV, so the structure is at the end of the clause.

Arabic high

بمجرد أن

Arabic is VSO/SVO and uses different particles.

Chinese n/a

一...就...

N/A

Learning Path

Prerequisites

Next
Connecting Actions with 于是 (yúshì)

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