German phrase
Was würde passieren, wenn ~?
Meaning
What would happen if ___?
When to use it
It asks about results. Use it to ask what may happen in a possible situation.
Example dialogue
Was würde passieren, wenn ich mein Visum nicht verlängere?
What would happen if I don't extend my visa?
Dann musst du sofort zum Ausländeramt gehen.
Then you have to go to the immigration office right away.