哪 + classifier + noun / 哪 + noun asks which item within a known set. It is a selection question rather than open-type question.
Selection among options - asks for one from identifiable set
Classifier-friendly - commonly 哪 + measure word + noun
Different from 什麼 - 哪 asks which one; 什麼 asks what kind/what thing
See examples below for varied real-world usage.
Use with contextual set of options
- Listener should know the candidate range.
Classifier usage improves naturalness
- 哪本, 哪個, 哪家, 哪天, etc.
Do not substitute blindly for 什麼
- The question intent changes.
Which book do you want?
Which day should we leave?
Which restaurant do you like?
Among these three plans, which one is most feasible?
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