German phrase
Was passiert, wenn ~ nicht möglich ist?
Meaning
What happens if ___ is not possible?
When to use it
Asks about the result. It is polite and neutral, often used to check changes or alternatives.
Example dialogue
Was passiert, wenn das Treffen nicht möglich ist?
What happens if the meeting is not possible?
Dann verschieben wir es auf nächste Woche.
Then we'll postpone it until next week.