一旦……就……

yídàn... jiù...

once... then... (一旦……就……)

一旦 A，就 B means “once A happens, B follows.” It often stresses that B should happen immediately or definitely after A.

Leitbeispiel

一旦决定了，就不要轻易改变。

Yídàn juédìng le, jiù bú yào qīngyì gǎibiàn.

Once you have decided, do not change it easily.

HSK 4

1 Strukturen

15 Übungen

Lektion im Überblick

Read the sample sentence and notice how 一旦……就…… works in the frame: 一旦 A，就 B.

Erklärung

一旦...就... introduces a condition that is important and often has a clear consequence. A is the trigger condition, and B is the result, decision, warning, or required action. It can be used for advice, rules, risks, and plans. Do not reverse 一旦 and 就. Compared with 如果...就..., 一旦...就... sounds stronger and often implies the condition is serious or decisive.

Strukturmuster

1 Strukturen

Grammatikmuster

一旦 A，就 B

sets a condition that immediately leads to a result or required action

一旦决定了，就不要轻易改变。

Yídàn juédìng le, jiù bú yào qīngyì gǎibiàn.

Once you have decided, do not change it easily.

Typische Fehler

Reversing the markers: 就一旦决定了，不要改变。Use 一旦 before the condition and 就 before the result: 一旦决定了，就不要改变。
Using 一旦 for a casual repeated habit: 一旦我每天吃饭，就看电视。For habits, use 每次...都... or 一边...一边... depending on meaning.

Hinweise zur Verwendung

一旦 often signals a serious or decisive condition.
就 marks the result or required action.
It is stronger than 如果...就... and common in warnings or rules.

Übungen

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Füll die Lücke:

____决定了，就不要轻易改变。

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