1. As a question word:
* Quand: This is the most common translation for "when" as a question word.
* Example: "When are you coming?" translates to "Quand viens-tu ?"
2. As a conjunction:
* Quand: This is used when "when" introduces a subordinate clause.
* Example: "I will call you when I arrive." translates to "Je t'appellerai quand j'arriverai."
3. As an adverb:
* Quand: This is used to indicate time.
* Example: "He arrived when I was leaving." translates to "Il est arrivé quand je partais."
4. As a phrase:
* À quel moment: This is used in more formal contexts.
* Example: "At what moment did you see him?" translates to "À quel moment l'avez-vous vu ?"
Note: The specific translation of "when" will depend on the context of the sentence.