1. "Quand" - This is the most common translation for "when" in general, used to ask or state a time.
* Example: "When did you arrive?" - "Quand es-tu arrivé ?"
2. "Lorsque" - This translation is more formal and is used for specific times or events.
* Example: "When I saw her, I was surprised." - "Lorsque je l'ai vue, j'ai été surpris."
3. "Dès que" - This translates to "as soon as," implying a close connection between two actions.
* Example: "When you finish, call me." - "Dès que tu auras fini, appelle-moi."
4. "Si" - This translates to "if," and can be used when "when" implies a condition.
* Example: "When you go to the store, buy some milk." - "Si tu vas au magasin, achète du lait."
It's important to consider the context of the sentence to choose the most appropriate translation.