一旦
yī dàn HSK 5

English Meaning

Categories

📚 Example Sentences

一旦下雨,我们就回家。
Yí dàn xià yǔ, wǒmen jiù huí jiā.
Once it rains, we will go home.
一旦你学会,就容易了。
Yí dàn nǐ xuéhuì, jiù róngyì le.
Once you learn it, it becomes easy.
一旦失败,可以再试。
Yí dàn shībài, kěyǐ zài shì.
Once you fail, you can try again.
一旦下雨,别出门。
Yídàn xià yǔ, bié chūmén.
If it rains, don't go out.
一旦迟到,就道歉。
Yídàn chídào, jiù dàoqiàn.
If you're late, apologize.

💡 Memory Tip

Think of 一旦 as 'one dawn' (一 means 'one,' 旦 depicts the sun rising over the horizon, symbolizing 'dawn'). Imagine that once the dawn breaks (一旦), a new day begins with inevitable changes—linking to the word's meaning of 'once something happens, then...'

📝 Usage Notes

一旦 is commonly used in both written and spoken Chinese, though it is slightly more formal and often appears in instructive, cautionary, or analytical contexts (e.g., advice, warnings, or discussions about consequences). It is typically placed at the beginning of a clause to set up the condition, followed by the result in the main clause.

📖 Grammar Points

一旦 is used in the structure: '一旦 + [condition/clause], (就) + [result/clause].' The adverb 就 (jiù) is often used in the result clause to emphasize the immediate consequence, but it can be omitted. For example: '一旦下雨,我们就取消活动。' (Once it rains, we will cancel the activity.)

🏯 Cultural Notes

In Chinese culture, 一旦 is frequently used in proverbs, advice, or warnings to convey the importance of foresight and caution, reflecting values like preparedness and the significance of small actions leading to major outcomes. It underscores a pragmatic view of cause and effect.

🔄 Similar Words

如果 (rúguǒ) means 'if' and is more general for hypotheticals, while 一旦 specifically implies 'once (something happens), then...' with a stronger sense of inevitability and often refers to a one-time, pivotal event. 既然 (jìrán) means 'since' or 'now that' and refers to an already realized condition, unlike 一旦's hypothetical nature.

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