THERE ARE ABOUT 40 AFFIXES USED IN BAHASA INDONESIA.

PREFIX: Ber

Can turn nouns into verbs:
Berjalan .......... Walk.
State of being.
Berhenti .......... Stop.
Berduduk... Be seated.
Bermobil... Have a car.
Bersama... Together.

PREFIX: Me, Mem

Used when the verb accompanies the subject:
Saya menulis .......... I write.

PREFIX: Ter

Like a stative verb in English, or the passive voice: