this key
What is this key for?
Si vous n'avez pas cette clé, vous ne serez dans l'incapacité d'entrer.
If you don't have this key, you won't be able to get in.
Have you tried this key?
Where did you get that key?
Have you tried this key?
Tu auras besoin de cette clé pour rentrer dans le bâtiment.
You’ll need this key to get into the building.
Where did you get this key?