French phrase
Que faire si ~ ?
Meaning
What should we do if ___?
When to use it
Asks what action to take in a hypothetical situation. It suits casual and formal contexts.
Example dialogue
Que faire si le temps est mauvais pour le pique-nique ?
What should we do if the weather is bad for the picnic?
On peut rester sous un abri ou reporter le pique-nique.
We can stay under shelter or postpone the picnic.