How do you say when in French?

"When" in French can be translated in a few different ways depending on the context:

For asking a question about time:

* Quand? - This is the most common way to ask "when?"

* À quel moment? - This is a more formal way of asking "when?"

For connecting clauses:

* Quand - This is the most common way to connect clauses, meaning "when."

* Lorsque - This is a more formal way to say "when."

* Dès que - This means "as soon as."

* Au moment où - This means "at the moment when."

Examples:

* Quand est-ce que tu arrives? - When are you arriving?

* J'irai te voir quand j'aurai du temps libre. - I'll go see you when I have free time.

* Lorsque j'ai vu le chat, j'ai crié. - When I saw the cat, I screamed.

* Dès que tu arrives, appelle-moi. - Call me as soon as you arrive.

The best translation of "when" depends on the specific situation and the desired level of formality.