...不是...嗎？ is a rhetorical question used to remind, challenge, or seek confirmation of something presumed obvious.
Expectation reminder - assumes listener should agree
Pragmatic pressure - can sound persuasive or confrontational
Different from neutral yes/no question - attitude is built in
See examples below for varied real-world usage.
Not equivalent to plain ...嗎？
- It carries stronger stance.
Tone and context decide politeness
- Can sound harsh if misused.
Use where shared background exists
- Works best with known facts/context.
Is this not what you wanted?
Did he not come yesterday?
Did you not say it was easy?
Is this not more effective?
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