趁（著）grammar point · tier 1 · seize the window: 趁(著) (do it while the chance holds)
· chèn(zhe)
Acts inside a window that is still open: do the main thing while the temporary condition holds, before it closes.
字源 FORM what the parts do
走 is legs running to catch the moment before it passes; 㐱 only gives the sound, worn over. The optional 著 hangs the window open as something still standing while you move.
故事 STORY a scene to remember it by
A door is swinging shut; legs break into a run and slip through while the gap still holds.
字源自撰記憶法
框 · Frame
趁(著) [open window / condition] ，[subj] [main act]
觸 · Trigger
A chance or condition that holds only for now, so the act must happen before it passes.
序 · The move
1Name the window that is open now but will close: a state still holding, a chance still standing.Is this condition temporary — will it pass if you wait? A permanent fact is not a 趁 window.
2Put 趁(著) in front of that window, at the head of the clause.趁 leads the condition; it never sits on the main verb or at the end.
3Place the main act after, done inside the window.Does the main act exploit the window — gaining from acting now rather than later? If timing brings no advantage, you want a plain 在…時 instead.
例 · Examples
1趁seize the open window飯菜the food還熱著still hot, the state holding時at the time，趕緊hurry, before it closes先來吃come eat first — the main act吧。
While the food is still hot, hurry and come eat first.
V著2 hangs 著 on a verb the subject is actively doing as a backdrop (吃著…看電視). 趁著 hangs 著 on a window-state that simply happens to hold (趁著年節), and 趁 adds the push to exploit it before it closes. Backdrop you keep going, versus a window you grab.
在…時
在…時 just timestamps when something happens, no urgency. 趁(著) says the timing is the advantage — act now because the window will shut. Neutral when versus seize-the-while.
一…就… chains the second act to fire the instant the first lands, pure sequence. 趁(著) acts inside a window that is still open, exploiting its duration. Trigger-point versus open-window.
✗ 趁他是我哥哥 → ✓ 趁他在的時候 (a permanent fact is no window; 趁 needs a passing condition)
English 'while' and 'when' carry no urgency, so learners reach for 當…時 or 在…時 and lose the seize-the-chance push; 趁 alone says act before the window shuts.