...了(變化) marks a change of state.
State change - Something becomes different
Not completion - For states, not actions
See examples below for varied real-world usage.
Change of state
- ✅ 天黑了。
- ❌ 天黑。（少了變化感）
Not for completed actions
- ✅ 天冷了。
- ❌ 我吃了。（這是完成，不是狀態）
It got dark, let us go back.
He got tired, so he will rest first.
The coffee has gone cold.
There are more people now, so the shop got noisy.
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