French phrase
Dans quels cas ~ ?
Meaning
Under what circumstances ___?
When to use it
Asks which conditions make a rule apply. This is relatively formal and precise.
Example dialogue
Dans quels cas un visa est nécessaire ?
Under what circumstances is a visa required?
Si vous restez plus de 90 jours, il faut un visa.
If you stay for more than 90 days, you need a visa.