If you request something, try to say:
1. Could you do it for me, please?
2. Do you think you could do it for me?
3. Would you be so kind to do it for me?
4. Would you mind doing it for me, please?
5. Could you do it for me, if you do not mind?
6. Can I ask you a favour, please?
7. Could you do me a favour, please?
I can not think of any others.