---
title: "一旦…就… in Chinese Grammar: Once …, …, With Examples"
description: "一旦…就…: once …, …. 一旦 A 就 B: once A happens (if it ever does), B follows. 2 real lines from stories, each word explained."
canonical: "https://mandarinthewild.com/chinese-grammar/yidan-jiu"
author: "Mandarin The Wild"
---

[Chinese grammar](https://mandarinthewild.com/chinese-grammar)

# 一旦…就…

Once …, …

一旦 A 就 B: once A happens (if it ever does), B follows.

## In stories

名字**一旦定下来，往往就很难再改**。

[世界上的“茶”为什么有两种叫法？ · Cha or tea? Why the world has two words for tea](https://mandarinthewild.com/library/read/cha-or-tea-why-the-world-has-two-words-for-tea#library-word-823-836) HSK 6

电梯里的摄像头**一旦识别出电动车，门就不会关上**，直到车被推出去为止。

[电动车为什么不能进电梯？ · Why are e-bikes banned from lifts in China?](https://mandarinthewild.com/library/read/why-are-e-bikes-banned-from-lifts-in-china#library-word-90-105) HSK 6

[Read 世界上的“茶”为什么有两种叫法？](https://mandarinthewild.com/library/read/cha-or-tea-why-the-world-has-two-words-for-tea#library-word-823-836)

## More patterns

- [一…就… as soon as …, …](https://mandarinthewild.com/chinese-grammar/yi-jiu)
- [verb + 一 + verb … a little; give it a try](https://mandarinthewild.com/chinese-grammar/v-yi-v)
- [一…，…就… as soon as …, …](https://mandarinthewild.com/chinese-grammar/yi-comma-jiu)
- [如果/要是…就… if …, then …](https://mandarinthewild.com/chinese-grammar/ruguo-jiu)
- [一 + measure word (+ noun) + 也/都 + 不/没 not a single …](https://mandarinthewild.com/chinese-grammar/yi-cl-ye-bu)
- [跟/和…一样 the same as …](https://mandarinthewild.com/chinese-grammar/gen-yiyang)

## What does 一旦…就… mean in Chinese?

Once …, …. 一旦 A 就 B: once A happens (if it ever does), B follows.

## How common is 一旦…就…?

It comes up in 2 readings of the 392 stories and articles in our free Library.

## Does it correct my mistakes?

No. It shows which patterns a text uses and what each one does; it doesn’t mark errors. Paste a sentence you wrote to see whether it uses the pattern you meant.

## More free tools

- [Chinese dictionary](https://mandarinthewild.com/chinese-dictionary)
- [Measure words](https://mandarinthewild.com/measure-words)
- [How hard is this text?](https://mandarinthewild.com/text-level)
- [Free Chinese stories](https://mandarinthewild.com/library)

Patterns found by our own parser; lines from our free Library.