do you expect harriet & emma will be friends for ever?why?

Yes, I expect them to be friends. Emma has taken Harriet uder her wing and is an excellent mentor. Their different social status' will be overcome and a true friendship will ensue. She does however make the mistake of "matchmaking" and setting Harriet up with a completely unsuitable man. She should have minded her own business and let her marry the farmer; Harriet loved him!