着 (zhe): states that hold
The particle for ongoing states and background actions — why the door 开着 while you 在开门.
A state, holding
着 after a verb freezes its result into a continuing state. 开 is the act of opening; 门开着 is the door standing open. Where English uses "is …-ing" for both actions and states, Chinese splits them: 在 + verb for an action underway, verb + 着 for a state that holds.
门开着。
她穿着一件红衣服。
墙上挂着一张地图。
Backgrounding one action behind another
Verb1 + 着 + Verb2 makes the first action the manner or backdrop of the second — doing B while A holds.
他笑着说。
我们坐着聊天吧。
Look up the word: 着 · All grammar guides
Patterns stick when you meet them in sentences you can read. The app drills each one at i+1, scheduled by FSRS.
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