connective N4 common casualpolitewritten

うちに — while ~ (before it changes)

うちに

Meaning

① while the chance lasts / before it changes: while ~ (still) / before ~ changes — do something now, taking advantage of a state that won't last
② gradual change (as ~ goes on): as ~ continues / in the course of ~ing — a change comes about unintentionally while the action goes on

うちに frames a state as temporary and says 'act within it'. With a positive state it's 'while it still holds' (明あかるいうちに); with a negative it's 'before the opposite sets in' (忘わすれないうちに = before forgetting). A separate use, 〜ているうちに, reports a gradual, unplanned change that emerges as the action continues. The common thread is a window that won't stay open.

Key sentence

① while the chance lasts / before it changes
Please eat it while it's hot.
② gradual change (as ~ goes on)
As we talked, we became friends.

Formation

Attaches toFormExample
Verb (dict / ている / ない) / i-adj / na-adj な / Nの + うちに Vる・ている・ない / Aい / Naな / Nの + うちに 若わかいうちに / 元気げんきなうちに / 休やすみのうちに

Examples

① while the chance lasts / before it changes
Let's head home while it's still light.
Let me jot it down before I forget.
② gradual change (as ~ goes on)
As I listened, I started getting sleepy.
Over the time I lived there, I came to love the town.

Easily confused with

〜間に 間あいだに neutrally locates an event within a span; うちに adds 'before the chance is gone' — urgency or seizing a fleeting state. 留守るすの間あいだに (just 'while out') vs 熱あついうちに ('while still hot — so hurry'). 前に 前まえに marks a clear point ('before X happens'); 〜ないうちに stresses acting *within the window* before a change creeps in — 暗くらくなる前まえに (before it gets dark) vs 暗くらくならないうちに (while it's not yet dark).

Notes

See うちに in real sentences

Jengo shows うちに the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Study it in Jengo

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