French phrase
Je ne pourrai pas ~.
Meaning
I won't be able to ___.
When to use it
A polite way to say something will not be possible. It often softens a refusal or expresses regret.
Example dialogue
Peux-tu venir à la réunion demain ?
Can you come to the meeting tomorrow?
Je ne pourrai pas venir à la réunion demain.
Unfortunately, I won't be able to come to the meeting tomorrow.