怎麼... in discourse-initial/comment positions can express challenge, surprise, dissatisfaction, or rhetorical push rather than neutral manner question.
Attitudinal question marker - speaker stance foregrounded
Rhetorical pressure effect - often challenge/complaint tone
Context-driven interpretation - can differ from plain "how" question
See examples below for varied real-world usage.
Tone and intonation are crucial
- Same wording can be mild or confrontational.
Do not always translate as procedural how
- Pragmatic force may dominate.
Use carefully in formal communication
- May sound accusatory.
How come you are only saying this now?
How could something this simple be wrong?
How come he is late again?
How come you did not confirm first?
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