Particle NO (の) end of sentence

The particle NO can replace the particle KA at the end of a sentence to indicate that it's a question in a colloquial way (with rising intonation).

いつスキーに行くの？

いつスキーにいくの？

When are you going skiing?

Used to soften a statement (used by women only).

毎週日曜日はヨガの教室に行くの。

まいしゅうにちようびはヨガのきょうしつにいくの。

I go to Yoga class every Sunday.

Used to soften a command.

そんな目で見ないの。

そんなめでみないの。

Don’t look at me like that.