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どこ行くの

where are you going?

→ どこ
phrase Uncommon #8,886
where are you going? A casual question; the subject is usually understood from context. The particle の gives the question a conversational tone.
JA: 今からどこ行くの？
EN: Where are you going now?

「どこ行くの？」「リヨン！」「どこよそれ？」

“Where are you going?” “Lyon!” “Where on earth is that?”

お兄ちゃん どこ行くの？

Where are you going, big brother?

— Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020)

こんな早くにどこ行くの？

Where are you going so early?

どこ行くの?

Where are you going?

— 暗殺の森 (1971)

どこ行くのよ？

Where are you going?

— フォーリング・ダウン (1993)

どこ行くの？

Where are you going?

— ANORA アノーラ (2024)

クリスマスはどこ行くの？

Where are you going for Christmas?

ペラヨ どこ行くの？

Pelayo, where are you going?

— オープン・ユア・アイズ (1997)

家族そろって、どこ行くの？

Where are you all going as a family?

母さん、どこ行くの？

Mom, where are you going?