At the bottom of the card , most invitations ask people to reply . You can use 'R.S.V.P.' to mean 'Please reply' . Why do you think we ahould write that ?
Tolong di jawab sekarang ya Pllliiisss.... Aku mohon Soalnya besok mau dikumpul
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We should write that to simplify ourselves, the person that we invite may/may not be there (at our party) and it'll be easy if he/she let us know first so we didn't have to prepare everything for nothing