Ek kaam kar doge mera? / Kya tum mera ek kaam kar sakte ho?

How to say “Ek kaam kar doge mera” in English

When you want to say “Ek kaam kar doge mera?” (or “Kya tum mera ek kaam kar sakte ho?”) in English, the natural, everyday way is “Could you do me a favor?”. It fits polite requests.