Phrases Asking for Favors or Assistance

Could I ask you a favor?

Meaning

Politely asks for a favor.

Translation language

John: <b>Could I ask you a favor</b>?
Alice: Sure, what is it?
John: <b>Could I ask you a favor</b>? Could you proofread my report before I submit it?
Alice: Of course, I'd be happy to.