うちに — While / Before (window of opportunity)
Expresses doing something while a state still exists, with the nuance that the situation may soon change — so act before that window closes. "While / before (it changes)."
Structure
[Plain form / い-adj / な-adj + な / Noun + の] + うちに
Examples
若いうちに、たくさん旅行したい。
Wakai uchi ni, takusan ryokō shitai.
While I'm young (before I get old), I want to travel a lot.
い-adjective describing a state that will change + うちに
雨が降らないうちに、帰りましょう。
Ame ga furanai uchi ni, kaerimashō.
Let's go home while it isn't raining (before it starts).
Negative verb + うちに = do it before the change happens
忘れないうちに書いておこう。
Wasurenai uchi ni kaite okō.
I'll write it down while I haven't forgotten (before I do).
Negative verb + うちに = critical "before" nuance
• The Clock is Ticking: Use うちに when the state (youth, nice weather, memory) will soon vanish if you don't act now. • Vs 間に (aida ni): 間に just marks a span of time during which something happens; うちに adds the pressure of "before it ends / changes."
Commonly confused with
The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones うちに is tested against.
vs 間に (あいだに)
間に neutrally marks "during the time that..."; うちに adds the nuance "while the chance lasts — before it changes," implying you should act in time.
vs まえに (前に)
前に = plainly "before X happens" (X is a definite point); うちに = "while a state still holds," emphasizing the ongoing window rather than a fixed point.
vs ながら
ながら = doing two actions simultaneously by the same person; うちに = doing something within a time window/state, not simultaneous multitasking.
More time expressions
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