是...的 (event-detail emphasis pattern) highlights time, place, manner, or agent of an already established event.
Detail focus - emphasizes specific event parameter
Presupposed event - event itself is treated as known/accepted
Frequent in clarification - answering where/when/how/who questions
See examples below for varied real-world usage.
Do not use for pure future plans normally
- Most natural with realized or established events.
Focus placement changes meaning
- Put emphasized element in 是...的 frame carefully.
Different from simple copula sentence
- This pattern is focus-marking, not basic identity.
I came yesterday (emphasis on when).
How did you come?
This book was bought in Japan (emphasis on where).
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