HSK 6
一⋯⋯便⋯⋯
yī ⋯ ⋯ biàn ⋯ ⋯
The structure 'as soon as... then...'
Explanation
一…便… yī… biàn… is a pair of connecting words in a compound sentence (a sentence with two or more clauses) expressing that two actions happen one right after the other immediately, equivalent to 'as soon as... (then/already)...' in Vietnamese. 便 biàn here is the formal way of saying 就 jiù (then, right away).
一 + [action 1]，(subject) 便 + [action 2].
when the second action happens instantly right after the first one is finished; it emphasizes immediacy and a tight sequence. Because it uses 便, the sentence carries a more written flavor compared to using 就.
using an incomplete pair (having only 一 but forgetting 便/就); or adding 了 le after the first clause (wrong: 一走出了…便…) — after 一, 了 is usually not used; also, do not confuse 便 biàn here with the 便 meaning 'convenient' in 方便 fāngbiàn.
Examples
As soon as I stepped out of the school gate and looked up, I saw her.
She put down the phone and, without even changing her clothes, rushed to the hospital.
As soon as he got home, he saw the food on the table.
Practice
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Learn “一⋯⋯便⋯⋯” effectively
The grammar point “一⋯⋯便⋯⋯” (The structure 'as soon as... then...') is one of the key structures at HSK 6. To use it fluently, you need to understand the contexts where it's used and practice regularly.
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