How do you ask what nationality are in french?

The most common and polite way to ask someone's nationality in French is:

"De quelle nationalité êtes-vous ?"

This translates to "What nationality are you?"

Here's a breakdown of the sentence:

* "De quelle" - of what (feminine form)

* "nationalité" - nationality

* "êtes-vous" - are you (formal, polite form)

You can also use the informal form, "De quelle nationalité es-tu?" if you are speaking to someone you know well.

Keep in mind that asking about someone's nationality can be sensitive. It's always best to be mindful of the context and approach the conversation with respect and sensitivity.