Expressing "once...then..." with "yidan...jiu..."

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一旦 (yīdàn) is used to express what would happen after a certain condition is met. Usually it is used with 就. This grammar pattern expresses that once one thing happens, something else will happen.

Structure

This structure is similar to the English "once...then," as in "once the company goes bankrupt, your family will lose all its money."

一旦 + Condition,Subj. + 就 + Consequence

Examples

  • 一旦 我 找 好 的 工作,我 会 安心。Yīdàn wǒ zhǎo hǎo de gōngzuò, wǒ jiù huì ānxīn.Once I find a good job, then I'll be able to relax.
  • 这 张 桌子 不 稳定,一旦 发生 什么 小 小 的 振动, 会 倒塌。Zhè zhāng zhuōzi bù wěndìng,yīdàn fāshēng shénme xiǎo xiǎo de zhèndòng,jiù huì dǎotā.This table isn't very steady. Once there's even a small vibration, it will fall over.
  • 学习 计算机 科学 的 学生 很 自信,他们 一旦 毕业, 会 找到 很 好 的 工作。Xuéxí jìsuànjī kēxué de xuéshēng hěn zìxìn, tāmen yīdàn bìyè,jiù huì zhǎodào hěn hǎo de gōngzuò.Computer science students are very confident. Once they graduate, they will be able to find good jobs.
  • 千万 不 要 在 经济 泡沫 中 炒股,一旦 市场 崩溃,你 会 很 后悔 的!Qiān wàn bùyào zài jīngjì pàomò zhōng chǎogǔ,yīdàn shìchǎng bēngkuì, nǐ huì hěn hòuhuǐ de!You must absolutely not trade stocks in an economic bubble. Once the market collapses, you will regret it!
  • 一旦 发生 事故,你 要 负责!Yīdàn fāshēng shìgù, nǐ yào fùzé!In case of an accident, you're responsible!
  • 有些 人 一旦 有 了 钱,就 变了。Yǒuxiē rén Yīdàn yǒu le qián, jiù biàn le.Some people change as soon as they have money.
  • 一旦 做出 决定,就 没有 借口,只有 认真 去 做。Yīdàn zuòchū juédìng, jiù méiyǒu jièkǒu, zhǐyǒu rènzhēn qù zuò.Once a decision is made, there is no excuse but to take it seriously.
  • 一旦 在 一个 很 舒服 的 环境 中,就 不想 继续 努力 了。Rén Yīdàn zài yīgè hěn shūfu de huánjìng zhōng, jiù bùxiǎng jìxù nǔlì le.Once you're in a comfortable environment, you don't want to keep trying.
  • 一旦 提高 价格,你 会 失去 很多 客户的。Yīdàn tígāo jiàgé, nǐ huì shīqù hěnduō kèhù de.If you raise your prices, you will lose a lot of customers.
  • 这种 病 很 复杂,一旦 染上,很难 治好。Zhèzhǒng bìng hěn fùzá, Yīdàn rǎnshàng, hěn nán zhì hǎo.This disease is very complicated and once you get it, it's hard to cure.

Notice in the last example there is no 就. Sometimes you can leave out the 就 and the context that the result will happen is pretty clear.

Sources and further reading

Books

HSK5