hmm, I think they are all the same. 'mempunyai' comes from a root word 'punya'. i mempunyai, simply u add som affixes 'me' and 'i' the formula will be me+punya+i it'll be pronounced as mempunyai. For me, 'punya' sounds less formal than 'mempunyai' :D I hope it helps.

Hi. I can help you with indonesia language. can you help me with english language? I want to be fluent in english. and I want to see a english movie without indonesia subtitle. Woud you like to be my friends? :) waiting for your response :) do you have skype,kakao,line or else? my skype : afrizal02 my kakao and line : af121zal02

i think what's difficult about Bahasa is the affixes :)

Terimah kasih!

punya is informal, mempunyai is formal :)