sentence-final の (question)
grammar41 sentences
The sentence-final particle の used as a soft question marker in casual speech, typically with rising intonation — 行くの? ('are you going?'), 何してるの? ('what are you doing?'), 何が起きたの? ('what happened?'). Warmer and more inviting than か. Common in feminine and child speech but broadly used across speakers in informal contexts. Combines freely with progressives (~ているの), past tense, and noun predicates (なの).