do me a favor

Hello everyone.

Can you do me a favor in/with this matter?

Which preposition is right here to use?

Can you do me a favour regarding this matter?

Beeesneees,

  1. Can you do me a favour in this matter?
    Is it wrong?
    Can I say?:
    “Can you do me a favour on this matter?”

I wouldn’t use either. They don’t sound natural.

Beeesneees,

  1. You can do me a favour by giving me your car.
  2. Raman did me a favour by helping (to do) my homework.
    Are these sentences OK?

1 - yes
2 - Raman did me a favour by helping me to do my homework. /Raman did me a favour by helping (me) with my homework.