What's the difference between 他穿着鞋 and 他在穿鞋?
着 shows the shoes are on; 在穿 means putting them on right now.
他穿着鞋 describes the shoes already on his feet. 他在穿鞋 describes the action of putting shoes on right now. Do not treat 着 as English -ing; it shows the result or background.
| Situation / Pattern | Formula | Natural | Avoid |
|---|---|---|---|
| Shoes already on | Subject + 着 + 鞋 | 他穿着鞋 | 他在穿鞋 (when you mean he has them on) |
| Putting shoes on now | Subject + 在 + 穿 + 鞋 | 他在穿鞋 | 他穿着鞋 (when you mean the action now) |