French phrase
Je ne pourrai pas répondre ~.
Meaning
I won't be able to reply to ___.
When to use it
Indicates inability to reply at a specific time. It is often used to explain a schedule or other constraint.
Example dialogue
Tu peux répondre à mon message ce soir ?
Can you reply to my message tonight?
Je ne pourrai pas répondre à ton message ce soir.
I won't be able to reply to your message tonight.