In Indonesia, most people (but by no means all people) trill or roll the consonant /r/. Some English-speaking learners find this hard to do, but if you can succeed in doing it your Indonesian will sound much more authentic. If you find the trilled /r/ difficult to produce, try exaggerating it first, making a loud purring noise whenever you meet an /r/ sound. After a while, when you have mastered the trill and it has become a habit, you can cut back on the exaggeration.
Try saying these words with a good, strong rolled /r/. (In the pronunciation guides below the letter /r/ is repeated and underlined to help you remember to roll it.)