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一旦

yī dàn

HSK 5

Meaning

  • in case (sth happens)
  • if
  • once (sth happens, then...)
  • when
  • in a short time
  • in one day

Definition

一旦，表示如果有一天或某一时刻发生某种情况，就会导致后面的结果。

Once, as soon as; indicating that as soon as a condition is met, a result follows.

Usage

常用于假设或条件句中，引出某一条件，后面常与'就'、'便'等连用。

Used in conditional or hypothetical sentences, introducing a condition, often followed by '就' or '便' to indicate a result.

Examples

  • 1 一旦发生火灾，请立即报警。(Once a fire breaks out, please call the police immediately.)
  • 2 一旦你做出决定，就不要轻易改变。(Once you make a decision, don't change it easily.)
  • 3 一旦下雨，比赛就会取消。(Once it rains, the match will be cancelled.)
  • 4 他一旦开始工作，就会忘记时间。(Once he starts working, he forgets the time.)
  • 5 一旦我们发现错误，会及时纠正。(Once we find a mistake, we will correct it promptly.)

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